The First of Two Identical Boxes of Mass M Is $\degree$

Multiple Choice

The first of two identical boxes of mass m is sitting on level ground.The second box is sitting on a ramp that makes a 20 $\degree$ angle with the ground.The normal force of the level ground on the first box is N_L;the normal force of the ramp on the second box is N_R.Which statement is correct?

A) N_R = N_L = mg.
B) N_L = mg;N_R = mg sin 20 $\degree$ .
C) N_L = mg;N_R = mg cos 20 $\degree$ .
D) N_L = mg;N_R = -mg cos 20 $\degree$ .
E) N_R = -N_L = -mg.