1. I believe the answer is: B. . Vasco da Gama
At that time, Vasco da Gama received an order from the empire to find new land that might provide huge amount of natural resources.
In 1497. he found a route that connected Europe to India, which provide a pathway for the empire to colonized southern asian Region.
2. I believe the answer is: A. Pedro Cabral
At that time, the trade route to india that founded by Vasco de Gamma Was dominated by strong Arabian Empires.
So, Pedro Cabral was ordered to found another trade route to India by the Empire. He stubmled upon the Brazilian territory in 1500 while seeking this new trade route.
3.I believe the answer is: Ferdinand Magellan
The expedition to circumnavigate the earth was began in 1519 by the order of the Portuguese empire. But Magellan was killed during the battle of mactan in 1921.
The expedition is completed by his successor named Juan Sebastian Elcano one year after magellan's death.