Height of the ball

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?
A.)  the ball took three seconds to reach its maximum height
B.)  the ball took three seconds to reach the ground
C.)  the ball was thrown from a height of three feet
​D.)  the ball reached a maximum height of three feet

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