If a Stone Is Dropped from a Height of Variable $958$

Multiple Choice

If a stone is dropped from a height of Variable $958$ isn't defined feet, its height after t seconds is given by $s = 958 - 22 t ^ { 2 }$ . Find the stone's velocity at time $t = 4$ .

A) $v = 264$ ft/s
B) $v = 704$ ft/s
C) $v = 44$ ft/s
D) $v = 176$ ft/s
E) $v = 88$ ft/s