Which of the following is least likely to be classified as an opportunity cost()

A. The cash savings related to adopting a new production process.

B. The cash flows generated by an old machine that is to be replaced.

C. The market value of vacant land to be used for a distribution center.

汽车制动时，由于摩擦动能转化为内能，这些内能______ （选填“能”或“不能”）自动地再次开动汽车．能量的转化和转移具有______．