Question

The quote below is an excerpt from the Charter of the United Nations:

Answer 1

Correct answer:

use combined military force of the member nations

Detail about the goals of the United Nations

The UN Charter, signed in 1945, lists the purposes of the organization in Chapter I, Article 1.  I'll quote below from the official wording as found in the UN Charter. The first point is the section quoted in your question.  I want to quote the other points to show that the UN seeks more than military solutions in its efforts to preserve and promote peace.

The Purposes of the United Nations are:

1. To maintain international peace and security, and to that end: to take effective collective measures for the prevention and removal of threats to the peace, and for the suppression of acts of aggression or other breaches of the peace, and to bring about by peaceful means, and in conformity with the principles of justice and international law, adjustment or settlement of international disputes or situations which might lead to a breach of the peace;
2. To develop friendly relations among nations based on respect for the principle of equal rights and self-determination of peoples, and to take other appropriate measures to strengthen universal peace;
3. To achieve international co-operation in solving international problems of an economic, social, cultural, or humanitarian character, and in promoting and encouraging respect for human rights and for fundamental freedoms for all without distinction as to race, sex, language, or religion; and
4. To be a centre for harmonizing the actions of nations in the attainment of these common ends.