A manager agent delegates to four subagents. One subagent's task involves reading a long, noisy log file. Why does this belong in a subagent rather than the main thread?

Answer: B — Context isolation — the log noise stays in that subagent's window and never pollutes the others

Context isolation is the reason to delegate — the noisy intermediate content lives and dies in that subagent's window. It typically increases total API calls rather than reducing them.