A particle moves with simple harmonic motion in a straight line . In first $\;\tau\;s\;$ after starting from rest it travels a distance a , and in next $\;\tau\;s\;$ it travels 2a , in same direction , then :

Question

(a) amplitude of motion is 3a\[\](b) time period of oscillations is $\;8\tau\;$\[\](c) amplitude of motion is 4a\[\](d) time period of oscillations is $\;6\tau\;$