GMAT Problem Solving (PS) | Re: In the circle above with center C, diameter AD = 18. Which of the foll

In the circle above with center C, diameter AD = 18. Which of the following must be true?

I. The length of minor arc BD is greater than 10.

II. Angle ABD measures 90 degrees.

III. Triangle BCD is equilateral.

A. II only
B. I and II only
C. I and III only
D. II and III only
E. I, II, andIII