Answer:
B.Party bosses repressed political opposition to keep control of government.
Step-by-step explanation:
Through corruption and lots of power, the PRI held office for over 80 years, even cheating in elections, where people knew that they were buying votes from the poorest people in the country, they even have records of using and having death people as active members of the party, they even registered and made death people vote for them using their ID´s.