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Solutions
Sentence I: It says that there has been a slump in the proportion of workers, private sector workers participating in defined – benefit retirement plans.
Statement II: It says that since by 2014, private sector workers participating in defined – benefit retirement plans had increased many folds as compared to the 1970’s (which includes 1979).
Sentence III: It says about the proportion of people contributing money in retirement account.
Sentence IV: It says about the social security and retirement saving.
Hence, statement I and II give contradictory information. Other options are also in context of the passage but don’t give contradictory information with respect to the passage.