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The correct answer is C. Salesforce documentation states that when a prompt template is grounded with a related list, the fields available for that related list are based on the page layout of the parent object for the current user. That means the Account page layout controls which related-list fields are exposed for prompt grounding. Option A is wrong because Prompt Builder does not require assigning related-list fields in JSON format. Option B sounds plausible because field selection is involved in Prompt Builder workflows, but it misses the key limitation being tested: related-list field availability is driven by the current user’s parent-object page layout. For exam purposes, the controlling consideration is the page layout dependency, not manual JSON formatting or generic field-picker behavior.