While Firms Buy Many of Their Inputs Through the Open

While firms buy many of their inputs through the open market,there is often a desire to produce critical inputs.A common concern in producing an input internally is that:

A) the firm will find it too easy to manage quality.
B) the firm will not be able to minimize costs over the long run.
C) outside competitors will learn about the quality of inputs.
D) the firm will get prompt supply of the input.