**PLS HELP**
A computer manufacturer built a new facility for assembling computers. There were construction and new equipment costs. The company paid for these costs and made combined profits of $40 million after 4 years, as shown in the graph:

Which equation most closely represents the line depicted in the graph?
[A] f(x) = −30x + 80
[B] f(x) = −40x + 4
[C] f(x) = 40x − 4
[D] f(x) = 30x − 80