A Rocket Orbits a Planet in a Circular Orbit at a Constant

Multiple Choice

A rocket orbits a planet in a circular orbit at a constant speed as shown in the drawing. Note these arrows:
-Suppose that the radius of the circular path is r when the speed of the rocket is v and the acceleration of the rocket has magnitude a.If the radius and speed are increased to 2r and 2v respectively, what is the magnitude of the rocket's subsequent acceleration?

A)
B) 2a
C) a
D) 4a
E) 8a