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

Answer & explanation
Correct answer: option 3
The correct answer is Option (3) →
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 (1) — Incorrect. This copies the top-right quarter as it is; the gap needs its mirror image across the horizontal line.
Option (2) — Incorrect. This is the correct piece turned through 90° anticlockwise.
Option (4) — Incorrect. The curved line of the correct piece is missing.