The correct order of the ability of the leaving groups is

A

$$OCOC_2H_5 > OC_2H_5 > OSO_2Et > OSO_2CF_3$$

B

$$OC_2H_5 > OCOC_2H_5 > OSO_2CF_3 > OSO_2Me$$

C

$$OSO_2CF_3 > OSO_2Me > OCOC_2H_5 > OC_2H_5$$

D

$$OCOC_2H_5 > OSO_3CF_3 > OC_2H_5 > OSO_2Me$$