What Does the Democratic Peace Theory Posit

What does the democratic peace theory posit?

A) Democracies are more peaceful than other regime types.
B) All nondemocratic governments are war prone.
C) Democracies are less likely to fight each other than nondemocracies.
D) Democracies are the most domestically stable governments, and are thus prone toward peace.
E) Democracies rarely have large armies, and are thus prone toward peace.