The long-term impact of Munn v Illinois (1877) on regulatory efforts w

The long-term impact of Munn v Illinois (1877) on regulatory efforts was

(a) to hold back federal efforts to regulate business.
(b) to prevent states from regulating interstate trade.
(c) to provide a temporary justification for regulating business.
(d) to establish government as able to regulate all businesses permanently.

ANSWER

(d)