Find All Numbers That Satisfy the Following $s ( t )$

Multiple Choice

Find all numbers that satisfy the following.
-An arrow is fired straight up from the ground with an initial velocity of 96 feet per second. Its height, $s ( t )$ , in feet at any time $t$ is given by the function $s ( t ) = - 16 t ^ { 2 } + 96 t$ . Find the interval of time for which the height of the arrow is less than 80 feet.

A) after $5 \mathrm { sec }$
B) between 1 and $5 \mathrm { sec }$
C) before $1 \mathrm { sec }$
D) before $1 \mathrm { sec }$ or after $5 \mathrm { sec }$