Answer:
Ummmmm, 21
Explanation:
Next time add a passage and answer choices
Trade with Mesopotamia Egypt and Phoenicia
The king of the Portuguese discovered Spain was in charge of the new world trips, and he was not happy about the matter. He then decides to write a letter to Spain, threatening the catholic faiths. They were afraid and decided to inform the pope. This, therefore, created a line between the nations. In a manner of avoiding wars, the Spanish were, however, likely to lose.
Finally, the Portuguese were not happy with the division because it barred them from getting to India, so they decided to negotiate through the catholic monarch.
The Answer you are looking for is B).
If you look back at WWII the way the U.S. ended the war was with a plane dropping the 2 atomic bombs on Japan. So I think that the "use of air-power" did more than a little to help change the way the war was fought.