The Collapse of Communism Is Important for Comparative Politics Because

The collapse of communism is important for comparative politics because:

A) scholars did not anticipate it, and it called their work to date into question.
B) many scholars using qualitative methods predicted it, while those using quantitative methods did not.
C) many scholars using quantitative methods predicted it, while those using qualitative methods did not.
D) the absence of communism as a point of comparison weakened the field.
E) it finally put an end to the use of Marxist ideas in the study of comparative politics.