sharmaprashant19 wrote:
Don't anyone think that in option C, the word "they" doesn't have a clear antecedent. "They" could be referring to genes or people.
The problem comes when the pronoun "they" becomes ambiguous. Here it is clearly referring to people and not genes as per the meaning of the sentence.
Think this way:
they -> Genes -> tend to cook less, eating more processed food -> nonsensical
they -> People -> tend to cook less, eating more processed food -> makes sense
Hope it helps.