Solve
-An Arrow Is Fired into the Air with an Initial

Multiple Choice

Solve.
-An arrow is fired into the air with an initial velocity of 160 feet per second. The height in feet of the arrow t seconds after it was shot into the air is given by the function $h ( t ) = - 16 t ^ { 2 } + 160 t$ . Find the maximum height of the arrow.

A) $1200 \mathrm { ft }$
B) $720 \mathrm { ft }$
C) $400 \mathrm { ft }$
D) $80 \mathrm { ft }$