Which of the Following Is True of the "Surge" Under

Which of the following is true of the "surge" under the Bush administration in 2007?​ 

A) It helped al Qaeda gain control over most of Iraq. 
B) It was the complete withdrawal of the U.S. troops from Iraq. 
C) It resulted in many Sunnis allying with the Americans. 
D) It helped the insurgents gain tremendous power. 
E) It failed to control the interethnic war in Iraq.