Answer: Option A
Explanation:
One of the main reason for proposals is to propose a potential solution to a problem, or an analysis of a potential solution to a problem or a proposed plan of maintaining a system. It is actually meant to convince your clients or stakeholders about the success of such proposal.
So option A doesn't explain why we have proposals not to convince your clients that a problem exist, there won't be a proposal without a problem been identified ,it is not to justify the existence of a problem ,but we have proposals to prove a solution to a system.