Correct option is C
Option (c) is the correct antonym of the given word.
Rancid describes the unpleasant, sour, or rotten smell or taste that typically results from the decomposition of fats or oils.
Synonyms: spoiled, rotten, putrid, and foul.
Antonyms: fresh, sweet, pleasant, and aromatic.
Meanings of all options-
Rotten - Decomposed and spoiled to the point of being unfit for use or consumption.
Urgent - Requiring immediate action or attention due to its importance or time sensitivity.
Fresh - Recently harvested or prepared and in a natural, clean, or unspoiled condition.
Rough - Having an uneven or irregular surface; not smooth or gentle in texture or appearance.