I believe that the correct answer should be B), because he worsened the relations with the Soviet Union, relations that were much better during the time of previous president, Richard Nixon. It wasn't that much about the Afghan people, since he thought that i posed a""a grave threat to the free movement of Middle East oil". Also, he lost his 1980 election to Ronald Reagan, who promised-and delivered-an even more vigorous anticommunist foreign policy, which is why I strongly believe that the correct answer is B).
The answer to your question is C
For people to express nationalism it is first necessary for them to identify themselves as belonging to a nation, that is, a large group of people who have something in common. The rise of centralized monarchies, which placed people under one rule and eliminated feudalism , made this possible. The realization that they might possess a common history, religion, language, or race also aided people in forming a national identity. When both a common identity and a formal authority structure over a large territory (i.e., the state) exist, then nationalism becomes possible.
Yup that’s true. They died due to disease, being killed and many other reasons.