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A gymnast practicing her vault gets a running start and then pushes off the vault with both hands to propel herself into the air. The gymnast's height above the ground in meters can be modeled by the expression $-4.9t^2 + 6.5t + 1.25$, where $t$ is the time in seconds after she pushes off the vault.$\newline$What does the number $1.25$ represent in the expression?$\newline$(A)the time in seconds from when the gymnast pushes off the vault until she reaches her highest point$\newline$(B)the time in seconds from when the gymnast pushes off the vault until she lands on the ground$\newline$(C)the height in meters of the gymnast when she pushes off the vault$\newline$(D)the height in meters of the gymnast when she reaches her highest point