Two springs A and B having spring constant K _A and K_B where K_A = 2K_B. These are stretched by applying force of equal magnitude. If energy stored in spring A is E then energy stored in B will be :

• A

  2E

• B

  $\frac{\mathrm{E}}{4}$

• C

  $\frac{\mathrm{E}}{2}$

• D

  4E