Good Morning!
a.the money the company earns after paying all of its production costs.
b.the total wages the company pays workers in its factories and stores.
c.the amount of money the company earns from selling an individual part.
d.the amount the company receives from the sale of all of its computer parts.
You forgot the alternatives. I reproduce them below:
The total revenue of this company is linked to the total sales revenue of all the pieces of computers, that is, the total gain from the sale of its products.
Hugs!