Arrange the compounds in order of decreasing acidic strength :
(I) `ClCH_(2)-CH_(2)-OH`
(II) `Cl_(2)CH-CH_(2)-OH`
(III) `Cl-CH_(2)-CH_(2)-CH_(2)-OH`
(IV) `CH_(3)-CH_(2)-CH_(2)-OH`
A. `I gt II gt III gt IV`
B. `IV gt III gt II gt I`
C. `II gt I gt IV gt III`
D. `II gt I gt III gt IV`
