Which statement correctly describes the difference between a polar covalent bond and a nonpolar covalent bond?

a: nonpolar covalent bonds involve sharing of protons whereas polar covalent bonds involve transfer of
protons.

b: nonpolar covalent bonds involve sharing of electrons whereas polar covalent bonds involve transfer of electrons.

c: nonpolar covalent bonds involve sharing of protons whereas polar covalent bonds involve sharing of electrons.

d: nonpolar covalent bonds involve two atoms that have equal electonegativity whereas polar covalent bonds involve two atoms that are unequal in their electronegativity.

e: nonpolar covalent bonds involve two electrons that have equal electonegativity whereas polar covalent
bonds involve two electrons that are unequal in their electronegativity.

answer is D  

Explanation:

Polar covalent bonding is a type of chemical bond where a pair of electrons is unequally shared between two atoms. ... If the electronegativity of two atoms is basically the same, a nonpolar covalent bond will form, and if the electronegativity is slightly different, a polar covalent bond will form.

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