Question

The rule below shows how the cost of a plumbing repair depends on the time it takes.
Multiply the hours of labor by $55, then add$80
If C=cost in dollars and h=hours of labor, which equation expresses the rule above ?
A.C(h)=55h+80
B.C(h)=80h+55
C.C(h)=80(h+55)
D.C(h)=55(h+80)
I think it's A but idk.