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During a round of golf, a player hits the ball with an initial upward velocity of $72$ feet per second. Therefore, the ball's height above the ground in feet, $t$ seconds after it is hit, can be modeled by the expression $-16t^2 + 72t$. This expression can be written in factored form as $-16t(t - 4.5)$. $\newline$What does the number $4.5$ represent in the expression? $\newline$(A)the time in seconds from when the player hits the ball until it reaches its highest point $\newline$(B)the time in seconds from when the player hits the ball until it lands on the ground $\newline$(C)the height in feet of the ball when it reaches its highest point $\newline$(D)the height in feet of the ball when the player hits it