What is a covalent bond? a bond in which electrons are transferred a bond in which electrons are shared a bond in which electrons are destroyed a bond in which electrons are created

He's right * ^^ that's all correct

Covalent bonds form when electrons are shared between atoms and are attracted by the nuclei of both atoms. In pure covalent bonds, the electrons are shared equally. In polar covalent bonds, the electrons are shared unequally, as one atom exerts a stronger force of attraction on the electrons than the other