Spacecraft a Is Traveling at a Speed of 0

Spacecraft A is traveling at a speed of 0.80 c toward spacecraft B, which is traveling in the same direction at a speed of 0.75 c. Spacecraft A shoots a projectile at a speed of 0.90 c toward spacecraft B. The speed of spacecraft B relative to the projectile is

A) 0.90 c.
B) 0.92 c.
C) 0.95 c.
D) 0.99 c.