Researchers Have Determined That There Is a Weak Relation Between

Researchers have determined that there is a weak relation between job productivity and job satisfaction.Based on the evidence they have collected,researchers __________________.

A) think this is because workers who enjoy their jobs work harder.
B) think this is because of the motivation that money provides workers.
C) think this is because so many workers are unhappy with their jobs.
D) haven't been able to agree as to why this is the case.