It's best in Brainly for you to ask one question at a time, each as a separate question. I'll respond to the first question you posted.
Which of the following was founded primarily to promote nationalist goals?
C. the Congress Party
The Congress Party, officially the Indian National Congress, was the political party founded in 1885 in India to work for independence from Britain as a nationalist goal for India.
OPEC stands for the Organization of the Petroleum Exporting Countries.
The Non-Aligned Movement was an international movement of nations seeking to remain free of commitments to the Cold War superpowers, the USA and USSR.
The United Nations is an international association.