Three Spaceships A, B, and C Are in Motion as Shown

Multiple Choice

Three spaceships A, B, and C are in motion as shown in the figure. The commander on ship B observes ship C approaching with a relative velocity of 0.83c. The commander also observes ship A, advancing in the rear, with a relative velocity of 0.48c. As measured by commander on ship B, at what speed is ship A approaching ship C?

A) 1.3c
B) 0.94c
C) 0.25c
D) 0.58c
E) 2.2c