- Sunita followed the recipe closely, but the cake smelled *** after twenty minutes in the oven.
- The answer strangely is not correct.
- The adjective "strange" is correct because it is describing the noun "cake," not the verb "smelled." "Smelled" is a linking verb here, and "strange" is its subject complement. Remember that subject complements are always nouns or adjectives, never adverbs.