If a Man Wishes to Use a Plane Mirror on a Wall

Multiple Choice

If a man wishes to use a plane mirror on a wall to view both his head and his feet as he stands in front of the mirror,the required length of the mirror:

A) depends on both the height of the man and the distance from the man to the mirror.
B) is equal to the height of the man.
C) is equal to one-half the height of the man.
D) depends on the distance the man stands from the mirror.