Pls help! will give brainlist!

The equations below represent the total amount charged, Y, by two different plumbers as a function of the number of hours worked, X.

Plumber A: y = 20x + 60
Plumber B: y = 40x

The graphs of these functions cross at the point (3, 120). What does the point (3, 120) signify?

A. The point (3, 120) is the slope of the system of equations.

B. The point (3, 120) is the Y intercept of the system of equations.

C. The point (3, 120) is the solution for the system of equations.

D. The point (3, 120) is when the plumbers worked 120 hours.