Explanation:

The sum of the exterior angle and interior angle of a regular polygon is 360⁰.
As the measure of each interior angle is 1500, the measure of each exterior angle will be 30⁰.
The number of sides of a regular polygon is given by the following relationship n = 360/exterior angle
As the value of each exterior angle is 30⁰, the number of sides = 12.

Hence, option 3 is the correct answer.