Comets Get Significantly Brighter in Our Skies as They Approach

Multiple Choice

Comets get significantly brighter in our skies as they approach the Sun because

A) they reflect more sunlight as they get closer to the source of light
B) they get bigger as the ice evaporates
C) they get closer to the Earth than when they were outside the orbit of Mars
D) they move faster and faster
E) more than one of the above