When a Hooke's Law Spring Is Stretched a Distance 3x,how

Multiple Choice

When a Hooke's law spring is stretched a distance 3x,how much is the increase in energy stored in it from when it was stretched a distance x? Give your answer in terms of a multiple of the energy stored in the spring when it is stretched a distance x.

A) It is 3 times as much.
B) It is 8 times as much.
C) It is 4 times as much.
D) It is 9 times as much.