7284. The novel was so interesting that I was oblivious of my surroundings.

✅ The correct answer is option D.
Indifferent : having no particular interest or sympathy; unconcerned.

Watchful : watching someone or something closely; alert and vigilant.

Aware : having knowledge or perception of a situation or fact.

Unmindful : not conscious or aware.

Oblivious : not aware of or concerned about what is happening around one.

Synonym of Oblivious is Unmindful