Answer:
Option C
Step-by-step explanation:
Most of the defense spending of NATO is funded by US government. NATO assures military commitments around the world. It is a military alliance formed in 1949 to allow its members to consult and cooperate on defence and security issues. It also promotes democratic values.
Hence, it can be said that the United States' role in NATO is to serve as a military ally and provide humanitarian aid
Option C is correct