Answer:
C. Military alliances based on political philosophies
Explanation:
The NATO and the Warsaw Pact are two military alliances that have emerged after the end of World War II, during the Cold War period. NATO was formed by the countries that were part of the allies, also including members that shared the capitalist philosophies, while the Warsaw Pact was formed by countries that shared the communism as their political philosophy. The USA was the leader of NATO, while USSR was the leader of the Warsaw Pact. The main reason for this military alliances was that they are able to protect their interests, be it politically, zones of influences, or economically, leading to lot of tensions between the two in the Cold War period.