Which of these molecular properties makes water (H2O) a polar solvent?

The oxygen (O) atom holds the electrons in the covalent bonds more closely than the hydrogen (H) atoms and develops a partial negative charge.
The hydrogen (H) atoms hold the electrons in the covalent bonds more closely than the oxygen (O) atom and develop a partial negative charge.
The oxygen (O) atom holds the electrons in the covalent bonds more closely than the hydrogen (H) atoms, and the hydrogen atoms develop a partial positive charge.
The hydrogen (H) atoms hold the electrons in the covalent bonds more closely than the oxygen (O) atom, and the oxygen atom develops a partial positive charge.