A Mass on a Spring Vibrates in Simple Harmonic Motion

Multiple Choice

A mass on a spring vibrates in simple harmonic motion at a frequency of 4.26 Hz and an amplitude of 3.00 cm.If a timer is started when its displacement is a maximum (hence x = 3.00 cm when t = 0) ,what is the acceleration magnitude when t = 3.74 s?

A) zero
B) 0.732 m/s²
C) 39.2 m/s²
D) 19.6 m/s²
E) 10.5 m/s²