Seasons on Mars Last Nearly Twice as Long as Those

Seasons on Mars last nearly twice as long as those on Earth because:

A) Mars' tilt on its axis is nearly twice the angle of Earth's tilt.
B) Mars takes nearly twice as long to rotate on its axis as Earth does.
C) Mars takes nearly twice as long to orbit the Sun as Earth does.
D) Mars is nearly twice as far from the Sun as Earth is.