Select the member of each pair that shows rate of `S_(N)2` reaction with `KI` in acetone.
A. `{:(CH_(3)-CH_(2)-CH_(2)-CH_(2)-CI, and ,CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(2)-CI),((I),,(II)):}`
B. `{:(CH_(3)-CH_(2)-CH_(2)-CI,and,CH_(3)-CH_(2)-CH_(2)-Br),((I),,(II)):}`
C. `{:(CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(2)-CH_(2)-CI, and ,CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)CI),((I),,(II)):}`
D. `{:(CH_(3)-CH_(2)-CH_(2)-overset(Br)overset(|)CH-CH_(3),and,CH_(3)-overset(CH_(3))overset(|)(CH)-CH_(2)-overset(Br)overset(|)(CH)-CH_(3)),((I),,(II)):}`
