i think that the Answer is B.
Back in 1418, Prince Henry from Portugal had started the very first school for navigation of the sea with something called astronomical observatory. The students were trained and taught in navigation, science, and map making.
In the past, Prince Henry was incredibly determined to find a way to navigate Cape Bojador. In fact, he was so determined to find a way, that he had sponsored fourteen expeditions over a period of twelve years. Unfortunately, he did not find a way and this lead to the success of Gil Eannes, an explorer. He successfully mapped his voyage for the exporters in the future.
All this informations leaves us with the necessary elements to fill the blanks in the paragraph. Here’s what the paragraph should look like when all the blanks are filled in correctly…
In hopes of finding a route to Asia, Prince Henry started the first school to teach sailors about oceanic navigation, map making, and more. He sponsored 14 expeditions in 12 years to try to navigate to Cape Bojador. Finally, Gil Eannes was able to successfully complete the journey. This became a stepping stone to find a maritime route to Asia.
- <em>Marlon Nunez</em>
The answer is B. The radio was a source of information in both the 1920s and the 1930s.
