[单选题]
4. Why is water a polar mynco)v 0)c gd4ol x,9w . ,badgygx88 ma4aj6kplecule?
A. Because it contains hydrogen.
B. Because hydrogen and oxygen are linked with a covalent bond.
C. Because there are hydrogen bonds in the water molecule.
D. Because the electrons in the covalent bond are not shared equally.
