He will object to my proposal.

My proposal will be objected to by him.
His objection will be to my proposal.
There will be an objection to my proposal by him.
The objection to my proposal will come from him.

The correct answer is D. The objection to my proposal will come from him.

A. My proposal will be objected to by him is incorrect because it is passive voice. The active voice is preferred in formal writing.

B. His objection will be to my proposal is incorrect because it does not specify who is objecting.

C. There will be an objection to my proposal by him is incorrect because it is too vague. It does not specify what the objection is or why he is objecting.

D. The objection to my proposal will come from him is the most concise and accurate way to express the sentence. It clearly states who is objecting and what they are objecting to.