All of the Following Are Reasons for Doubting the Democratic

All of the following are reasons for doubting the democratic peace EXCEPT:

A) democratic states may not have had a chance to fight with each other in the nineteenth century,because there were few democracies at that time.
B) the major democratic states did not go to war against each other during the nineteenth century,but they did experience many crises that nearly led to war over colonies.
C) too many democracies have actually fought against each other since the end of World War II to find the theory believable.
D) democratic states in the twentieth century may not have fought with each other because they were allied against a more powerful nondemocratic enemy.
E) rather than democracy causing peace,some other factor may cause both democracy and peace.