Springs X and Y undergo elastic extension. The graphs illustrate how the applied force $F$ varies with extension $x$ for each spring. Which statement is correct?
- AWhen each spring is given the same extension, the energy stored in Y is 4 times the energy stored in X.
- BWhen each spring is given the same extension, the energy stored in Y is 8 times the energy stored in X.
- CWhen the same force is applied to each spring, the energy stored in Y is 4 times the energy stored in X.
- DWhen the same force is applied to each spring, the energy stored in Y is 8 times the energy stored in X.