I took strong objection . . . . . . . . the proposal. A. with B. against C. to D. on

The correct answer is B. against.

The word “against” is used to express opposition or disagreement. In this sentence, the speaker is saying that they strongly disagree with the proposal.

The other options are not as appropriate in this context. The word “with” can be used to express agreement or support. The word “to” can be used to express a direction or destination. The word “on” can be