Which of the following statements best characterizes why scholars of international relations are interested in examining civil wars?

Civil wars have almost all of the same characteristics as wars between different nations.

Civil wars are virtually always proxy wars of larger states that compete on the international stage.

Civil wars are usually influenced by factors that or external to a state, and civil wars usually have effects on states beyond the one facing conflict.

Civil wars are so rare in occurrence that all political scientists study them when the do happen.