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 during production.
B) the total cost of components is the same as the price of chips purchased from a chip manufacturer.
C) there is a large number of microchip suppliers in the market.
D) its managers place a high value on their time.
E) all the microchip suppliers offer identical or homogenous products.