The coordinator concatenates outputs from six subagents, about 60 pages, and passes them to the synthesis subagent. Final reports consistently cover findings from the first and last subagents well but often leave out important findings from the subagents in the middle of the input. What change best addresses this?

Answer: A — Place a key-findings summary at the beginning of the aggregated input and organize the detailed results under explicit section headers for each subagent's contribution.

The lost-in-the-middle effect means content in the middle of long inputs is processed less reliably. A key-findings summary up front and explicit section headers help counter it (task 5.1). Randomizing order (b) only spreads the omissions around and makes the output unpredictable. An instruction to read carefully (c) doesn't change how position affects attention. Synthesizing each output separately (d) loses cross-source synthesis and produces a disjointed report.