Starting from the origin a body oscillates simple harmonically with a period of 2 s. After what time will its kinetic energy be 75% of the total energy ?

Question

( A ) $\frac{1}{4}s$
( B ) $\frac{1}{3}s$
( C ) $\frac{1}{6}s$
( D ) $\frac{1}{12}s$