The right answer is a) a new constitution.
The military regime came to an end and the New Republic, with the return to the primacy of civil power. A moderate opponent of the dictatorship and consensus to lead the peaceful transition to a democratic regime, Tancredo Neves fell ill on the eve of his inauguration and failed to take office, dying on April 21, 1985. José Sarney, who was one of the leaders of the regime which ended up - but which helped to bury it by joining the opposition - became the first civilian president since 1964.
The Constitution of 1988 is the major symbol of a history of success: the transition from an authoritarian, intolerant and often violent state to a democratic rule of law. During its term, five presidential elections, by direct, secret and universal vote, with public debate broad, popular participation and alternation of political parties in power. More than the Constitution guaranteed the country two decades of institutional stability.