The correct answer is C because the requirement is built around the essential prompt elements of task, context, constraints, and format. The task is to summarize support case notes. The context is the customer issue, troubleshooting steps, and next actions. The constraints are the five-sentence limit, plain-language requirement, no jargon, and the exact phrase to use when no next action exists. The format controls how the final summary should be presented. Option A is incorrect because "LLM Clarity Score" is not a prompt construct. Option B is weaker because token limits are not the same as business constraints such as sentence count and required wording. Salesforce guidance recommends prompts that clearly cover task, context, format, and constraints.