A business case is a document that provides the rationale and justification for initiating a project or a change. A business case typically includes the description of the business need, the analysis of the current state and the desired state, the evaluation of the solution options, and the recommendation of the preferred solution. A business case can also include the estimation of the costs, benefits, risks, and impacts of the solution, as well as the return on investment (ROI) and the payback period. A business case can help the business analyst (BA) to justify the additional funds for the implementation of the solution, by showing how the solution will deliver value to the organization and the stakeholders, and how it will address the business need and the requirements. Therefore, option A is the correct answer. The other options are not sufficient to justify the additional funds for the implementation, as they only focus on one aspect of the solution, such as the cost, the risk, or the benefit, and do not provide a comprehensive and compelling argument for the solution. Reference: BABOK Guide, page 31; Business Analysis Expert Certification, CCBA| IIBA, section "What Should I know to be CCBA Certified?"