What Piece of Evidence Suggests That the Martian Moons Did

Multiple Choice

What piece of evidence suggests that the Martian moons did NOT form with Mars?

A) Their composition is significantly different from Mars and the terrestrial planets.
B) They have ages that are much younger than Mars.
C) They have circular orbits above the Martian equator.
D) They rotate synchronously, with one side tidally fixed toward Mars.
E) They are both irregularly shaped and are heavily cratered.