The order of rate of hydrolysis of alkyl halides `1^(@),2^(@),3^(@)` and `CH_(3)X` by the `S_(N^(2))` pathway is :
A. `1^(@)gt2^(@)gt3^(@)gtCH_(3)X`
B. `CH_(3)Xgt3^(@)gt2^(@)gt1^(@)`
C. `CH_(3)Xgt1^(@)gt2^(@)gt3^(@)`
D. `3^(@)gt2^(@)gt1^(@)gtCH_(3)X`