Kepler's Third Law Relates the Period P and the Semimajor $\pi$

Multiple Choice

Kepler's third law relates the period P and the semimajor axis a of an orbit. For a circular orbit, P = 2 $\pi$ a/v, so it is possible also to relate the speed at which the particle orbits, v, to a. The result is

A) as a increases, both P and v increase.
B) as a increases, P increases but v decreases.
C) as a increases, P decreases but v increases.
D) as a increases, both P and v decrease.