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 that had refused to evacuate from the island
B) to stop Japan from annexing the islands
C) to quell an insurrection of Filipinos who opposed annexation by the United States
D) to defeat the Boxer Rebellion
E) to avenge the Russian surprise attack on Manila