Solve the Problem $176 \mathrm { ft } / \mathrm { sec }$

Multiple Choice

Solve the problem.
-A flare fired from the bottom of a gorge is visible only when the flare is above the rim. If it is fired with an initial velocity of $176 \mathrm { ft } / \mathrm { sec }$ , and the gorge is $448 \mathrm { ft }$ deep, during what interval can the flare be seen?
$$\left( h = - 16 t ^ { 2 } + v _ { O } t + h _ { O } \right)$$

A) $8 < t < 11$
B) $12 < t < 15$
C) $0 < t < 4$
D) $4 < t < 7$