Answer:
C) a base-mediated aldol condensation .
Explanation:
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In this case, an aldol condensation is a condensation organic reaction whereby an enol or an enolate ion reacts with a carbonyl compound (from a ketone or aldehyde) to form a β-hydroxyaldehyde or β-hydroxyketone or more specifically an aldol reaction.
Afterwards, it is followed by dehydration in order to yield conjugated enone which is also evidencing a protonation.
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