For the following reactions where, Z^ = CH_3 CH_2 O^ (A) or (B), k_s and k_e, are, respectively, the rate constants for substitution and elimination,…

For the following reactionswhere,$\displaystyle \mathrm{Z}^{\ominus}=\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{O}^{\ominus}$ (A) or (B), $\displaystyle \mathrm{k}_{\mathrm{s}}$ and $\displaystyle \mathrm{k}_{\mathrm{e}}$, are, respectively, the rate constants for substitution and elimination, and $\displaystyle \mu=\frac{\mathrm{k}_{\mathrm{s}}}{\mathrm{k}_{\mathrm{e}}}$, the correct option is \_\_\_\_.