The correct answer choices are A and C.
As Portugal learned about Spain's exploration expeditions led by Columbus, and fearing the Spaniards might interfere with their exclusive sea routes to the Far East, it filed a complaint before the pope at the time, Alexander VI (also known as Rodrigo Borgia, a high hierarchy priest of the Catholic Church born in Valencia, Spain, and apparently sympathetic to the Catholic Monarchs of Spain). In response to Portugal's complaint the pope issued a papal bull (a legal settlement ordered by the Church) and a demarcation line was traced leaving most of the known and yet-to-be-found lands and water bodies westwards under Spain, and those eastwards under the control of the Portuguese. A lucky "accident" left the lands today known as Brazil as the only colony in America ruled by Portugal, which explains why Brazilians are the only Latin Americans who speak Portuguese and not Spanish. A formal agreement, based on the papal bull, was signed by Spain and Portugal and became known as the Treaty of Tordesillas, named after the city where the signature of the document took place.
