Solve the Problem $f ( x ) = 1 + 1.6 \ln ( x + 1 )$

Multiple Choice

Solve the problem.
-The function $f ( x ) = 1 + 1.6 \ln ( x + 1 )$ models the average number of free-throws a basketball player can make consecutively during practice as a function of time, where $x$ is the number of consecutive days the basketball player has practiced for two hours. After how many days of practice can the basketball player make an average of 8 consecutive free throws?

A) 78 days
B) 80 days
C) 276 days
D) 278 days