Which of the Following Is Not Correct

Multiple Choice

Which of the following is not correct?

A) An example of adverse selection is man who tries to sell his used car without disclosing that it needs a new transmission.
B) The "invisible hand" of a free market will always fix the problems of adverse selection and moral hazard.
C) An employer may try to prevent a moral hazard problem by paying her workers an efficiency wage.
D) One interpretation of gift giving is that it reflects asymmetric information and signaling.