According to Basic Economic Theory, How Can One Assess Whether

According to basic economic theory, how can one assess whether workers in a certain industry are overpaid?

A) By comparing the desirability or the undesirability of their working conditions with those of other workers.
B) By comparing their wages to wage norms in other industries
C) By comparing the educational attainment of the labour force with that of other workers
D) By surveying the workers and asking them whether they think that their wages are too high
E) By the existence of long queues of qualified workers whenever there are vacancies, and witnessing few quits