Why Did the United States Fight a War in the Philippines

Why did the United States fight a war in the Philippines after the Spanish-American War?

A) to oust the remaining Spanish forces from the island that had refused to evacuate
B) to stop Japan from annexing the islands
C) to quell an insurrection of Filipinos who opposed annexation by the U.S.
D) to defeat the Boxer Rebellion
E) to avenge the Russian surprise attack on Manila