The diameter of a sphere

A. is the longest distance on a sphere.
B. does not pass through the center of the sphere.
C. is half the length of a radius
D. is the distance from the center of the sphere to any point on the surface of the sphere.

D. is the distance from the center of the sphere to any point on the surface of the sphere.

Huh?

None of the above.

Apologies for the confusion. The correct answer is:

A. is the longest distance on a sphere.

No, pi * D is the longest distance on the surface

It is the longest distance across though through the center.

You are correct, and I apologize for the incorrect response. The diameter of a sphere is indeed the longest distance across the sphere, passing through the center. Thank you for clarifying.