NEED HELP PLEASEE I AM BEGGING YOU PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Which of the following is a nonlinear function?

A.
Irene is reading a book. She reads 3 pages per minute.
B.
Daniel is studying a certain type of bacterial cell that doubles every hour.
C.
Cheryl uses 6 apples for each apple pie she bakes.
D.
Hally lives in a rental apartment. The rent increases by $100 every 15 months.