Choose the figure which is different from the other three.

The correct answer is Option (4) → 

Count the sides. Three figures each have an odd number of sides. Option (4), an arrowhead-shaped four-sided figure, has four sides, an even number, so it is the odd one out.

Option (1) — Incorrect. A heptagon (seven-sided figure): seven sides, an odd number.

Option (2) — Incorrect. A pentagon: five sides, an odd number.

Option (3) — Incorrect. A triangle: three sides, an odd number.