单选题 Which of the following is true as to the essential functions of the U.N.?

A、 It's only concerned with human rights.
B、 It only solves economic and cultural problems.
C、 It co-ordinates actions of nations where necessary.
D、 It only aims to develop friendly relations.

【正确答案】 C

【答案解析】从第四段第一句话谈到了联合国的基本作用。