8117. he novel was so interesting that I was oblivious of my surroundings.

✅ The correct answer is option B.
precarious : not securely held or in position; dangerously likely to fall or collapse.

unmindful : not conscious or aware.

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

watchful : watching someone or something closely; alert and vig

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

Synonym of oblivious is unmindful