If attaining a pass in Microeconomic Theory is very difficult because of rigorous academic standards and high demands upon the intellect, yet students learn absolutely nothing of any practical relevance, then it is most likely that:
A. Everyone will study Microeconomics in a pooling equilibrium.
B. A pass in Microeconomics sends a credible signal to employers regarding ability.
C. Studying Microeconomics is a socially efficient use of resources.
D. Students will not be hired upon graduation.