The function y = 4.25x + 6 represents the total amount of money, y, earned over x hours.

What is true about the function?

A It is linear because it is always increasing.It is linear because it is always increasing.
B It is nonlinear because it is always increasing.It is nonlinear because it is always increasing.
C It is linear because it increases at a constant rate.It is linear because it increases at a constant rate.
D It is nonlinear because it increases at a constant rate.