The passage suggests which of the following about the workers who took temporary jobs during the 1980s？
A. Their jobs frequently led to permanent positions within firms.
B. They constituted a less demographically diverse group than has been suggested.
C. They were occasionally involved in actions organized by labor unions.
D. Their pay declined during the decade in comparison with the pay of permanent employees.
E. They did not necessarily prefer temporary employment to permanent employment .
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