在下列反应中属一元饱和醇脱水的反应是()
A.ROH+HNO2→RONO+H2O
B.ROH+H2SO4→ROSO3OH+H2O
C.RCH2CH2OH→RCH=CH2+H20
D.CH3OH+HCOOH→HCOOCH3+H20
正确答案是C