[20 points} {pls help} {brainliest}
Which statement best differentiates between the terms supine and prone?

A. Supine is lying with the back facing up; prone is lying on the back.
B. Supine is lying on the back; prone is standing.
C. Supine is standing; prone is lying on the back.
D. Supine is lying on the back; prone is lying with the back facing up.