Use structure of a quadratic expression

A ball was thrown upward into the air.  The height, in feet, of the ball above the ground t seconds after being thrown can be determined by the expression -16t² + 40t + 3.  What is the meaning of the 3 in the expression?  Select the correct answer.
A.)  The ball takes 3 seconds to reach its maximum height
B.)  The ball takes 3 seconds to reach the ground
C.)  The ball was thrown from a height of 3 feet
D.)  The ball reaches a maximum height of 3 feet

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