In 1887, Congress appointed specialists in the railroad industry as the first Interstate Commerce Commissioners. Future regulatory commissions followed this pattern because it


A.solved the problem of how to elect the large number of commissioners needed.

B.granted commissions total control over their industries since they had industry experts.

C.increased the commissions' budgets from the federal government if they had expert leaders.

D.helped commissioners better understand and solve the problems in their specific industries.