Where a Critical Fact Is Recalled Most Reliably in a Long Prompt

You're building a document Q&A feature over long contracts. You have room to place one especially important retrieved clause anywhere in an otherwise long prompt. Based on the published "lost in the middle" research on long-context recall, where should you place it to maximize the odds the model uses it correctly?

A. Position doesn't matter — recall accuracy is statistically uniform across all positions in the context window. B. Only near the very end of the prompt, right before the question — placing it near the start provides no benefit at all. C. Near the start or the end of the prompt — recall is weakest for information placed in the middle, forming a roughly U-shaped accuracy curve by position. D. Only near the very start of the prompt, right after the system instructions — placing it near the end provides no benefit at all.