Correct Answer: A, CTo persuade the client to keep the project active, the project manager can use two effective tools or techniques: Alternatives analysis and Cost-benefit analysis. Alternatives analysis helps to evaluate and compare different options or courses of action, potentially identifying alternative solutions that can better meet the client's needs and expectations. This demonstrates the value of the project by showcasing various viable ways to achieve success, thus increasing the client's confidence in continuing. Cost-benefit analysis is crucial as it quantifies the financial and non-financial benefits against the costs, highlighting the advantages, potential returns, and overall value of keeping the project going. By presenting a clear analysis of the benefits versus the costs, the project manager can provide compelling evidence to justify the continuation of the project.