某羧酸CnHmCOOH10.1mol发生加成反应时,需要单质溴32g.0.1mol该酸完全燃烧时产生CO2和H2O共3mol.则该酸是
A:C17H35COOHB:C15H27COOH
CC17H33COOHDC17H31COOH