Which answer figure best represents the mirror image of the question figure…

Concept

A mirror placed along a vertical line produces a lateral (left-right) reflection: every point moves to the opposite side of that line, so the left-right order reverses. A vertical mirror does not turn the figure upside down; the reliable check is whether each element's horizontal position and left-right direction have reversed while the recognisable element stays the same.

Apply to this figure

The mirror is the vertical line XY on the right, so reflect each element horizontally while keeping top and bottom unchanged:

• Triangle: it remains upright because a vertical mirror never flips top and bottom.

• Shaded diamond-like mark: it is near the upper-left in the source figure, so its reflected position is near the upper-right. The small shaded detail in the artwork is schematic; its side and placement are the tested mirror features.

• Plus sign (+): it is at the lower-right, so it moves to the lower-left.

• Arrow: it points up-and-right in the source figure, so its horizontal direction reverses and it points up-and-left.

Cross-check

The best matching offered figure therefore has an upright triangle, the shaded mark at the upper-right, the plus sign at the lower-left, and the arrow pointing up-left. The other offered figures each break one of these mirror rules, so the figure with those four features is the intended mirror image.