Select the most appropriate option to improve the highlighted segment in the given sentence. If there is no need to improve it, select ‘no improvement required’.
Eighty girls sat there at four long tables, doing their homework by candlelight.

Correct option is B

The correct answer is (b) No improvement required.
Explanation:
· The sentence uses present participle "doing" to show a simultaneous action with the main clause:
· “Eighty girls sat there... doing their homework...”
· “by candlelight” is the correct phrase to show means/method.
Grammar Structure Used:
✔ Main clause + participle clause (present participle for ongoing/simultaneous actions)
✔ Possessive pronoun “their” correctly matches with plural “girls”
Incorrect Options:
· (a) “to have done” – awkward past perfect structure
· (c) “to doing” – incorrect verb form after preposition
· (d) “doing its homework” – mismatch in number (its ≠ girls)
�� Grammar Booster:
Use present participle (-ing) to describe secondary actions happening at the same time as the main verb in past.