Arrange the following alkyl halides in decreasing order of the rate or `beta`-elimination reaction alcoholic KOH.
A. `CH_(3)-underset(CH_(3))underset(|)overset(H)overset(|)(C)-CH_(2)Br`
B. `CH_(3)-CH_(2)-Br`
C. `CH_(3)-CH_(2)-CH_(2)-Br`
A. igtiigtiii
B. iiigtiigti
C. iigtiiigti
D. igtiiigtii