Why Do Federal Agencies Often Report to More Than One

Why do federal agencies often report to more than one overseer?

A) Authority over the federal bureaucracy is divided between the different branches.
B) Many of the secretaries of the executive cabinets hold multiple positions within the government.
C) All federal agencies are required, by the Constitution, to keep all three federal branches informed of their work.
D) All federal agencies directly report to the vice president, as laid out by Article 3 of the Constitution.