Which statement explains how political bosses were able to gain and maintain power?

Which statement explains how political bosses were able to gain and maintain power?
select one:
a. they bribed state and local officials in return for government appointments.
b. they gave to constituents on the local level in return for their votes.
c. they used the courts to delay elections until they consolidated their power.
d. they withheld local services until people pledged to give the boss their votes.