The united nations has been most successful in resolving disputes between the major powers ending civil wars limiting the increase in the number and power of nuclear weapons ending fighting between small nations

The correct answer for this question is this one: "C. limiting the increase in the number and power of nuclear weapons." The United Nations has been MOST successful in limiting the increase in the number and power of nuclear weapons.

Here are the clear choices.
A. resolving disputes between the major powers
B. ending civil wars
C. limiting the increase in the number and power of nuclear weapons
D. ending fighting between small nations