The correct answer to this question is A) both led to militarism.
The outcome of Nationalism and Imperialism is that both led to militarism.
Imperialism is when a powerful nation colonizes smaller countries in order to get their raw or natural resources. Such was the case of England or France in Africa and India. They colonize some regions of those places and exploited their natural resources.
Nationalism is the extreme expression of devotion that individuals have for its country. Nationalism played a key role in Nazi practices before and during World War II.
The outcome of Nationalism and Imperialism is that both led to militarism. Many wars had started due to Nationalism, Imperialism, and Militarism. This last one can be understood as a policy in a powerful country that promotes a strong Army and Navy, that invest a lot of money in weaponry and is ready to wage war.