One quarter of the figure below is missing. Which option completes the figure?

Answer & explanation
Correct answer: option 1
The correct answer is Option (1) →
The figure is symmetric about the horizontal line through its centre: the bottom half is the mirror image of the top half. So the missing bottom-right quarter is the mirror image of the top-right quarter across the horizontal line.

Why the other options are incorrect
Option (2) — Incorrect. This is the correct piece flipped across its middle line (its mirror image).
Option (3) — Incorrect. This is the top-left quarter turned round into the gap; the gap needs the mirror image of the quarter beside it.
Option (4) — Incorrect. One line of the correct piece is missing.