Which statement is NOT true about covalent bonds?

A)Covalent bonds form when an electron is completely lost or gained from an atom.
B)A covalent molecule contains one or more covalent bonds.
C)A single covalent bond is drawn as a line between two atoms.
D)A pair of electrons is shared between two atoms for each covalent bond.
E)Shared electrons allow an atom to complete its valence shell in a covalent molecule.