Solve the Problem $D$ Digits in T Minutes, Where $D=-0.2 t^{2}+9 t$

Multiple Choice

Solve the problem.
-Participants in a memorization experiment were able to recall an average of $D$ digits in t minutes, where $D=-0.2 t^{2}+9 t$ . Use the graph below to find the approximate value of $-0.2 t^{2}+9 t$ for $t=4$ .

A) 32 digits
B) 52 digits
C) 12 digits
D) 72 digits