Use the Figure to the Right to Answer the Next

Multiple Choice

Use the figure to the right to answer the next problem. The orbits of two planets orbiting a star are shown.The semimajor axis of planet A is twice that of planet B.
-The speed of planet A when it is at A is _____ the speed at A'.

A) less than
B) equal to
C) greater than
D) unable to tell
E) depends on the mass of the star