Reviewers cannot trace most statistics in a research system's final reports back to a source. Subagents return prose summaries of what they read, and the synthesis agent combines them. What is the most effective fix?

Answer: B — Require subagents to return claim-source mappings that synthesis must preserve and merge

Attribution is lost when findings are compressed into prose. Structured claim-source mappings (claim, source URL or document, excerpt) carried through synthesis keep it intact. (A) asks synthesis to cite information it never received. (C) attaches sources after the fact, which may not be where the claims came from. (D) removes the content instead of fixing provenance.