When Tuning a Piano, a Technician Strikes a Tuning Fork $\pi$

Multiple Choice

When tuning a piano, a technician strikes a tuning fork for the A above middle C and sets up a wave motion that can be approximated by
Y = 0.001 sin 880 $\pi$ t,

Where t is the time (in seconds) .

What is the period of the function

A) $\frac { 1 } { 880 }$ sec
B) 440 sec
C) $\frac { 1 } { 440 }$ sec
D) 880 sec
E) 88 sec