The number of adults who attend a music festival, measured in hundreds of people, is represented by the function a(d)=−0.3d2+3d+10, where d is the number of days since the festival opened. The number of teenagers who attend the same music festival, measured in hundreds of people, is represented by the function t(d)=−0.2d2+4d+12, where d is the number of days since the festival opened.

What function, f(d) , can be used to determine how many more teenagers than adults attend the festival on any day?

A. f(d)=0.1d2+7d+2

B. f(d)=−0.1d2+d+22

C. f(d)=−0.1d2+7d+2

D. f(d)=0.1d2+d+2