7281. Few teachers have been spared the problem of an obstreperous pupil in the class.

✅ The correct answer is option B.
sullen : bad-tempered and sulky.

unruly : disorderly and disruptive and not amenable to discipline or control.

lazy : unwilling to work or use energy.

awkward : causing difficulty; hard to do or deal with.

obstreperous : noisy and difficult to control.

Synonym of obstreperous is unruly