Melissa's Favorite Exercise Equipment at the Gym Consists of Various

Melissa's favorite exercise equipment at the gym consists of various springs. In one exercise, she pulls a handle grip attached to the free end of a spring to 0.80 m from its unstrained position. The other end of the spring (spring constant = 45 N/m) is held in place by the equipment frame. What is the magnitude of the force that Melissa is applying to the handle grip?

A) 29 N
B) 36 N
C) 42 N
D) 54 N
E) 66 N