PLEASE HELP ASAP!!! NEED TO TURN ASSIGNMENT IN!!!

Red: y = 7x
Blue: y = 5x³
Green: y = 4x²
Purple: y = 3^x

As x gets very large, which function becomes largest and remains so?

A. y = 4x²
B. y = 7x
C. y = 5x³
D. y = 3^x ​