Arrange the following compounds in order of increasing dipole moment .
Toluene `(I)` m-dichlorobenzene `(II)`
o-dichlorobenzene `(III)` . P-dichlorobenzene `(IV)` .
A. I lt IV lt II lt III
B. IV lt I lt II lt III
C. IV lt I lt III lt II
D. IV lt II lt I lt III
