1Each box in the grid contains the same three shapes (circle, triangle, parallelogram) stacked in a different vertical order. Study the pattern connecting the three boxes shown, then determine which answer choice correctly completes the missing box.
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Answer: <svg xmlns="http://www.w3.org/2000/svg" width="170" height="262" viewBox="0 0 170 262"><rect x="0" y="0" width="170" height="262" fill="#ffffff"/><rect x="1" y="1" width="168" height="218" fill="#ffffff" stroke="#111827" stroke-width="2"/><polygon points="85.0,21.2 106.6,58.7 63.4,58.7" fill="#6b7280" stroke="#111827" stroke-width="2"/><polygon points="75.9,96.5 105.6,96.5 94.1,123.5 64.4,123.5" fill="#6b7280" stroke="#111827" stroke-width="2"/><circle cx="85.0" cy="173.8" r="21.7" fill="#6b7280" stroke="#111827" stroke-width="2"/><rect x="0" y="218.0" width="170" height="44" fill="#111827"/><text x="85.0" y="249.0" font-size="22" font-weight="bold" font-family="Arial, sans-serif" text-anchor="middle" fill="#ffffff">A</text></svg>
Rule: each successive box is generated by a single-step upward cyclic rotation of the stack — the shape that occupies the top position moves to the bottom, and the other two shapes shift down to fill the remaining slots. Box 1 shows triangle (top), parallelogram (middle), circle (bottom). Applying the rotation gives Box 2: parallelogram (top), circle (middle), triangle (bottom). Applying it again gives Box 3: circle (top), triangle (middle), parallelogram (bottom). Applying the same rotation a third time to Box 3 reproduces the missing stack: triangle (top), parallelogram (middle), circle (bottom) — this is option A. Option C rotates the stack in the downward direction instead, which incorrectly reconstructs Box 2's arrangement rather than continuing the established rotation. Option B applies an incomplete transformation, swapping only the top and bottom shapes (leaving the middle shape fixed) of Box 3 rather than performing the full three-position rotation, so it fails to follow the rule consistently. Option D preserves the correct rotated order but replaces the shape in the bottom position with a square, a shape outside the shared set of circle, triangle, parallelogram, violating the requirement that every box use only the same three shapes.
Rule: each successive box is generated by a single-step upward cyclic rotation of the stack — the shape that occupies the top position moves to the bottom, and the other two shapes shift down to fill the remaining slots. Box 1 shows triangle (top), parallelogram (middle), circle (bottom). Applying the rotation gives Box 2: parallelogram (top), circle (middle), triangle (bottom). Applying it again gives Box 3: circle (top), triangle (middle), parallelogram (bottom). Applying the same rotation a third time to Box 3 reproduces the missing stack: triangle (top), parallelogram (middle), circle (bottom) — this is option A. Option C rotates the stack in the downward direction instead, which incorrectly reconstructs Box 2's arrangement rather than continuing the established rotation. Option B applies an incomplete transformation, swapping only the top and bottom shapes (leaving the middle shape fixed) of Box 3 rather than performing the full three-position rotation, so it fails to follow the rule consistently. Option D preserves the correct rotated order but replaces the shape in the bottom position with a square, a shape outside the shared set of circle, triangle, parallelogram, violating the requirement that every box use only the same three shapes.