Mars Completes One Orbit Around the Sun in Approximately Two

Multiple Choice

Mars completes one orbit around the Sun in approximately two Earth years. Mars orbits at an average distance to the Sun of about 1.5 AU, and Mars' mass is about 1/10 of Earth's mass. Therefore Mars' orbital speed is _____ the orbital speed of Earth.

A) about 0.8 times
B) 1.5 times larger than
C) about 1/10 of
D) about 3 times