21. Which statement about hydrogen bonding is true?
(A) hydrogen bonding is the intermolecular attractive forces between two hydrogen atoms in solution.
(B) the hydrogen-bonding capabilities of water molecules cause CH3CH2CH2CH3； to be more solublein water than is CHJOH
(C) hydrogen bonding of solvent molecules with a solute will not affect thesolubility of the solute
(D) hydrogen-bonding interactions between molecules are stronger than thecovalent bonds within the molecule
(E) hydrogen bonding arises from the dipole moment created bythe unequal sharing of electrons in certain covalent bonds within a molecule