7670. It was on the behest of the officer that he made those improvements.

✅ The correct answer is option B.
Suggestion : an idea or plan put forward for consideration.

Orders : the arrangement or disposition of people or things in relation to each other according to a particular sequence, pattern, or method.

Recommendation : a suggestion or proposal as to the best course of action, especially one put forward by an authoritative body.

Request : an act of asking politely or formally for something.

Behest : a person’s orders or command.

Synonym of Behest is Orders