Solve the Problem $D$ Digits In $t$ Minutes, Where $D=-0.1 t^{2}+8 t$ Use the Graph Below to Find the Approximate Value

Multiple Choice

Solve the problem.
-Participants in a memorization experiment were able to recall an average of $D$ digits in $t$ minutes, where $D=-0.1 t^{2}+8 t$ . Use the graph below to find the approximate value of $-0.1 t^{2}+8 t$ for $t=2$ .

A) -5 digits
B) 35 digits
C) 55 digits
D) 15 digits