The correct answers would be questions D " Did any of the Japanese or German students learn to speak Navajo" and E " What kind of code did the American Indians use during World War I". These are the questions that could help the reader understand the military leader's fear, since if the answers are yes they did learn to speak it, and a simple code, (respectively) then it would be perfectly sane to feel apprehension at using the same code again. Options A, B and C are not relevant because they do not contribute to the subject, for example, it doesn't matter how many people spoke Navajo before World War I, what is important is how many can learn it.
The part of speech is conjunction.
Charles Darwin was the man who went to an island called New Guinea. He observed a lot of the animals on different parts of the island and found differences in the same species this was found in all of the animals he observed. A giraffe with a short neck will not be able to eat leaves off of a tall tree, so it dies. It is not supposed to be there so it will evolve. This theory is known as B.
I really hope that this will help you out in the future. :)
