Which of the following are the reasons why some scholars are skeptical about democratic peace theory?a. Democratic states may not have had any chance to fight with each other in the 19th century because there were few democracies at that time.b. democratic states in the 20th century may not have fought with each other because they were allied against more powerful nondemocratic enemy.c. the cost of war is lower for democratic leaders than autocratic leadersd. capitalism may cause both democracy and peace at the same time.

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