Arrange the following four alkyl halides in descending order with respect to the E2 elimination to S_N2 substitution product ratio expected in their reactions with sodium ethoxide in ethyl alcohol. Explain your answers.

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CH,I (CH3)2CHCH₂-Br A B (CH3)3CCH₂CH₂CH₂-Br C (CH3)2CHCH-Br I CH3 D