What was NOT a source of tension between European countries leading up to World War 17

Question

A rationalism
B. imperialism
C militarism
D. socialism

Answer 1

World War 17 does not exist, but assuming you meant World War I:

A. Rationalism was not a significant source of tension between European countries leading up to World War I. The primary sources of tension were imperialism, militarism, and alliances between nations. Socialism did exist and was a growing movement at the time, but it was not a major factor in the tensions that led to the outbreak of World War I.