Aregular polygon has 15 sides. which is a possible angle of rotational symmetry for the figure? 12° 45° 72° 90°

We are asked to solve for the angle of rotational symmetry of a given regular polygon and the formula is degrees of rotation = 360° / number of sides. In this problem, the solution is shown below:
We used n = 5 since pentagon has five number of sides
degrees of rotation = 360° / 5 
degrees of rotation = 72°

The answer is the third in the choices 72°.