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A model rocket flies up into the sky. When the rocket reaches a height of $500$ feet, it starts to fall back down. The rocket's height above the ground in feet can be modeled by the expression $500 - 16t^2$, where $t$ is the time in seconds after the rocket starts to fall back down.$\newline$What does the quantity $16t^2$ represent in the expression?$\newline$Choices:$\newline$(A)the time in seconds it takes for the rocket to fall $t$ feet$\newline$(B)the time in seconds it takes for the rocket to reach a height of $t$ feet$\newline$(C)the height in feet of the rocket above the ground after $t$ seconds$\newline$(D)the distance in feet the rocket has fallen after $t$ seconds$\newline$