A 2x2 grid of tiles possesses reflectional symmetry about both the vertical and horizontal centerlines. If Tile (1, 1) shows a diagonal line sloping from top-left to bottom-right, what must Tile (1, 2) show under vertical centerline reflection?
Options:
(A) A diagonal line sloping from top-right to bottom-left
(B) A horizontal straight line
(C) A vertical straight line
(D) An identical top-left to bottom-right line
Answer Key:
A
Step-by-Step Solution & Explanation
Reflecting a segment with negative slope across a vertical mirror line reverses its lateral direction, producing a segment with positive slope (top-right to bottom-left).