A particle moving with simple harmonic motion passes through points p and q with the same velocity. having taken 2s in passing from p to q, it returns to q afte

A particle moving with simple harmonic motion passes through points P and Q with the same velocity. Having taken 2s in passing from P to Q, it returns to Q after another 2s. The period (in seconds) is: (a) 2 (b) 4 (c) (d) 8 6