Which section of a research paper provides a comprehensive overview of previous works on the general and specific topics considered in the study?

Protecting internal validity

A) is a minor concern in experimentation. B) cannot be achieve with fewer than 100 participants. C) is the primary purpose of experimentation. D) is achieved whenever sample size is equal in all the groups.

Identify an example from recent history that illustrates the difficulty the United Nations has had in maintaining international peace and cooperation.

What will be an ideal response?