Sentence Correction (SC) | During the economic recession of of 2008-09, insurance companies

During the economic recession of 2008-09, insurance companies incurred substantial losses marketing elaborate insurance products that, due to a decline in consumerinterest in complex insurance products, were never sold.

A- interest in complex insurance products, werenever
CORRECT

B- interest in complex insurance products, neverwas
Plural verb "WERE" should be used for plural noun "PRODUCTS". Hence Incorrect.

C- interest,the complex insurance products , was never
INTEREST was
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