Why were few court cases won against monopolies and trusts during the Gilded Age?

Why were few court cases won against monopolies and trusts during the Gilded Age?

a. Monopolies and trusts were strengthened by the Sherman Act.
b. Monopolies and trusts were supported by the public.
c. Monopolies and trusts were supported by state legislators.
d. Monopolies and trusts were supported by the federal courts.