In a 3x3 grid, what is the top-left value after a horizontal reflection of the standard arrangement 1 2 3 / 4 5 6 / 7 8 9?

• A. 7
• B. 3
• C. 1
• D. 9

Answer: (B)

Flipping left and right in each row moves the leftmost value to the right end and the rightmost value to the left. In the top row, 1 2 3 becomes 3 2 1 after this horizontal (left-right) reflection, so the top-left position now holds the original top-right value, which is 3. If it were a flip across a horizontal line, the top-left would instead become 7, but the intended reflection here yields 3.