Store Clerks Are Known to Have Low Wages

Store clerks are known to have low wages. This is likely to reflect the fact that

A) store clerk jobs are perceived to be relatively easy, thus attracting low-skill workers.
B) store clerk jobs are perceived to be relatively difficult, thus attracting high-skill workers.
C) many people perceive the job of store clerk as having significant risk of death on the joc.
D) store clerks are required to have a college degree.