If a Rock Is Thrown Downward with an Initial Velocity $V$

Multiple Choice

If a rock is thrown downward with an initial velocity of 8 feet per second, then its velocity $V$ , in feet per second, after seconds is given by $V = 32 t + 8$ .
By how much does velocity increase over a 6-second period?

A) 32.14 feet per second
B) 192.51 feet per second
C) 32 feet per second
D) 192 feet per second