Which of the following is one of the major subfields of political

Which of the following is a potential confounding factor in within-subjects designs but NOT in a between-subjects design?

A) regression to the mean B) sequence effects C) attrition D) history

Although many people think of armed conflicts as something that occurs between two sovereign states, in reality, civil war is far more common than interstate war

a. True b. False Indicate whether the statement is true or false