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A pebble is dropped from the edge of a tall cliff into the ocean. The pebble's height above the ocean in feet can be modeled by the expression $400 - 16t^2$, where $t$ is the time in seconds after the pebble is released.$\newline$What does the quantity $16t^2$ represent in the expression?$\newline$Choices:$\newline$(A)the height in feet of the pebble above the ocean after $t$ seconds$\newline$(B)the distance in feet the pebble has fallen after $t$ seconds$\newline$(C)the time in seconds it takes for the pebble to fall $t$ feet$\newline$(D)the time in seconds it takes for the pebble to reach a height of $t$ feet$\newline$