Sorry for posting again-- But I need help with this question too

Question

2. A sphere has a diameter of 28 millimeters. What is the circumference of the great circle?
A. 43.96 millimeters

B. 87.92 millimeters**

C. 125.84 millimeters

D. 615.44 millimeters

I think I did something wrong, so can someone check

Answer 1

Yes, it would be B.
C= π x r
radius would be 28/2 = 14
2π x 14 = 87.92 millimeters

Answer 2

Thank you!