If Reference Frame a Is in Motion with Respect to Reference

If reference frame A is in motion with respect to reference frame B, the velocity of an object with respect to frame A

A) cannot equal the velocity of the object with respect to frame B.
B) may or may not equal the velocity of the object with respect to frame B.
C) must equal the velocity of the object with respect to frame B.
D) None of the previous answers is correct.