CAYLEY 2022 Problem 7

Points A, B, C, D, E, and F are evenly spaced around the circle with centre O, as shown. The measure of \angle A O C is

Image

Answer Choices
A. 90^{\circ}
B. 150^{\circ}
C. 144^{\circ}
D. 120^{\circ}
E. 108^{\circ}