Determine Whether or Not the Function Is Linear $t$ Seconds After Being Dropped from an Altitude of 249 Feet

Multiple Choice

Determine whether or not the function is linear. If it is, determine the slope and interpret it.
-The height of an object $t$ seconds after being dropped from an altitude of 249 feet is given by the function h(t) = $- 16 t ^ { 2 } + 249$

A) Not linear
B) Linear; -16; The height of the object decreases 16 feet each passing second.
C) Linear; 249; The height of the object decreases 249 feet each passing second.
D) Linear; -16; The height of the object increases 16 feet each passing second.