Select the most appropriate option that can substitute the highlighted segment in the given sentence to improve it. If no improvement is required, select ‘No improvement required’.
As bombs keep falling on Gaza, hundreds of thousands of children have been order to flee their homes.

Correct option is B

The correct substitution of the highlighted words is (b) "have been ordered to flee."
· The subject of the sentence, "hundreds of thousands of children," is plural, so the correct auxiliary verb is "have." Additionally, the correct phrase is "ordered to flee," which indicates that the children were commanded to leave their homes.
· Grammatical rule used: When the subject is plural, the correct auxiliary verb is "have," and "ordered to" is followed by the base form of the verb "flee."
· Example: "The soldiers have been ordered to evacuate the area."