What was a major cause of World War I? O A. The rise of Japan as a world power
O B. American involvement in European affairs
O C. Complex European alliances
O D. The defeat of Spain in the Spanish-American War

C. Need I explain more?

There were several reasons. Serbia was an ally of Russia, Austria-Hungary was an ally of Germany. France was an ally of Russia. Britain was an ally of France. And soon enough it blew up.

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.