Which of these does NOT describe a friction that might prevent firms from choosing the optimal level of capital? A. Making too big of a change can be more expensive than making a few smaller changes. B. A firm might not be able to borrow enough to pay for the investments it wants to make. C. The firm likes its workers and doesn’t want to replace some jobs with machinery. D. Some capital is very specialized and cannot be re-sold in cases of economic downturns.