Effective prompting in Microsoft 365 Copilot requires two critical components: clear instructions and grounding in authoritative content. Microsoft guidance emphasizes that prompts should explicitly state the desired output format, tone, length, and purpose. In this case, specifying "a bulleted list of three to five concise, simply worded key points" represents concise instructions, making option B essential.
Additionally, grounding the response in a specific knowledge source-such as attaching or referencing the proposal document-ensures factual accuracy and reduces hallucination. Option D ensures Copilot uses the actual proposal content rather than relying on generalized model knowledge.
Profiles and stakeholder contact details are unrelated to summarization requirements. Therefore, the correct selections are B and D.