Answer:
Hasty generalization
Explanation:
A hasty generalization is a fallacy in which we draw a conclusion or make a broad generalization on a topic based only on a specific observation or sample of an action, event, person, etc., instead of looking at sufficient statistics and samples of that topic. The statement uses this logical fallacy because the speaker concludes that all flowers must smell wonderful only because the roses (which are an insufficient sample) smells good.
