This is a personal question, which means that only you can answer it. However, I can give some examples that might help guide your work.
An example of a primary source that you might encounter in your own life is that of a news article. As this article is likely to be written by a reporter witnessing the events, it can be considered a primary source. On the other hand, an example of a secondary source would be a non-fiction book that talks about a historical event. This is because such a book would give a second-hand account of an event based on historical information.
Answer:
3. The Great Depression in Texas was especially damaging to the agricultural sector because: b) a severe drought destroyed crops
4. How did supply and demand affect the economy of Texas during the 1930's? : a) Overproduction led to price
Hope this helped
Answer: The answer you are looking for here is “The United States believed only military intervention could stop communism”
Have a nice day!
