One Reason a Computer Manufacturer May Make Its Own Microchips

One reason a computer manufacturer may make its own microchips rather than buy them is that _____

A) it can maintain control over the quality of microchips during production.
B) the total cost of components is the same as the price of microchips purchased from a microchip manufacturer.
C) there are a large number of microchip suppliers in the market.
D) the managers working in computer-manufacturing firms place a high value on their time.
E) all the microchip suppliers offer identical or homogenous products.