Complete the campus gossip's observation about a rather oblivious freshman. Choose the correct adverb to form a natural English expression.

While the rest of the class panicked about the surprise midterm, Kevin sat in the back row, _____ unaware of the impending academic doom.

The correct answer is blissfully unaware.

"Blissfully unaware" is a fixed collocation used to describe someone who has no idea about a negative situation, and is therefore happy because of their ignorance.