A research system produces a report on "the economic effects of an aging population." Every subagent returns accurate, well-cited findings, but the report covers only pensions and healthcare costs, with nothing on labor markets, housing, or consumer spending. The coordinator's logs show two subtasks: "pension system strain" and "healthcare spending growth." Which change most directly addresses this?

Answer: C — Revise the coordinator's decomposition so subtasks span the topic's full breadth before work is assigned

Subagents did their assigned work correctly; the gap was created by an overly narrow decomposition at the coordinator. No subagent was ever asked about labor, housing, or spending. Changing synthesis (a), search depth (b), or analysis filters (d) blames downstream agents working correctly within the scope they were given.