Answer : 3. "scent"
Explanation :

"Scent" refers to a pleasant or distinctive smell, especially a pleasant fragrance or aroma. It is the appropriate term to describe the quality of the French perfume in this context.

The other options, "sent," "send," and "cent," have different meanings. "Sent" is the past tense of the verb "send," "send" is a verb meaning to dispatch or transmit something, and "cent" is a unit of currency. None of these fit the context of describing the quality of a perfume.