The relative order of rate of esterification of acids is
A. `RCH_(2)CO OH gt R_(2)CHCO OH gt R_(3)C COOH`
B. `RCH_(2)CO OH lt R_(2)CHCO OH gt R_(3) C CO OH`
C. `RCH_(2)CO OH lt R_(3)C CO OH lt R_(2)CHCO OH`
D. `R_(3)C CO OH gt RCH_(2)CO OH gt R_(2)CHCO OH`