What is the decreasing order of the inductive effect for the following benzyl/allyl systems (where $R$ is an alkyl group)?
- A$(CH_3)_3C - > (CH_3)_2CH - > CH_3CH_2 -$
- B$CH_3CH_2 - > (CH_3)_2CH - > (CH_3)_3C -$
- C$(CH_3)_2CH - > CH_3CH_2 - > (CH_3)_3C -$
- DNone of these
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