Choose the figure which is different from the other three.

The correct answer is Option (1) → 

Compare the dots with the sides. In three figures the number of dots is equal to the number of sides. Option (1), a trapezium, has four sides but five dots, so it is the odd one out.

Option (2) — Incorrect. An octagon: eight sides and eight dots, the same number.

Option (3) — Incorrect. A hexagon: six sides and six dots, the same number.

Option (4) — Incorrect. A narrow-topped trapezium: four sides and four dots, the same number.