Explanation
Effluvium refers to an unpleasant or harmful odor or discharge, so its antonym is a pleasant scent, which is "Fragrance." The other options—land, solid, and essential—do not relate to smell.
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Effluvium refers to an unpleasant or harmful odor or discharge, so its antonym is a pleasant scent, which is "Fragrance." The other options—land, solid, and essential—do not relate to smell.