Choose the piece from the options that completes the figure below.

Answer & explanation
Correct answer: option 2
The correct answer is Option (2) →
The figure is symmetric about both the vertical and the horizontal lines through its centre: each quarter is the mirror image of the quarter beside it. So the missing top-right quarter is the mirror image of the top-left quarter across the vertical line.

Why the other options are incorrect
Option (1) — Incorrect. This is the correct piece flipped across its middle line (its mirror image).
Option (3) — Incorrect. One line of the correct piece is missing.
Option (4) — Incorrect. The black triangle of the correct piece is missing.