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单项选择题

Regarding to the electric dipole, which statement as follows is wrong?
A、The electric dipole is composed of a positive charge of  and a negative charge of  , and the positive and negative point charges have separation  , and thus the dipole moment can be expressed as 
B、The electric dipole is the name given to two point charges of equal magnitude and opposite sign, separated by a distance that is small compared to the distance to the point  at which we want to know the electric and potential fields.
C、The potential arising from a point charge is inversely proportional to the distance  , while that of a electric dipole is inversely proportional to .
D、The maximum magnitude of electric field is inversely proportional to .

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