A spring in a toy gun has a spring constant of 8.20 N/m and can be compressed 21.0 cm beyond the equilibrium position. A 1.00 g pellet resting against the spring is propelled forward when the spring is released. If the pellet is fired horizontally from a height of 1.50 m above the floor, what is the range?

a. 6.1 m

b. 12.5 m

c. 15.8 m

d. 9.3 m