Which statement explains why a covalent bond between two different atoms is polar?
A. One atom has gained one or more electrons and the other has lost one or more electrons.

B. The electrons are attracted to the atom which has the greatest atomic mass resulting in an unequal distribution of charge.

C. The bonding pair of electrons are attracted more strongly to the atom with the less negative value of electron affinity resulting in an unequal distribution of charge.

D. The bonding pair of electrons are attracted more strongly towards the more electronegative atom resulting in an unequal distribution of charge.