Why Did Congress Establish Regulatory Commissions

Why did Congress establish regulatory commissions?

A) to hedge against the potential political costs of delegation by restricting the influence of presidents and party politics on regulatory decisions
B) to avoid placing bureaucratic layers between a president and agencies
C) an admission that Congress needed more information if it was going to regulate the economy more effectively
D) members of Congress focused on short-term concerns so they decided that commissions could make better long-term decisions