Here is the full question with choices: When hydrogen is attached to the more highly electronegative oxygen atom in a water molecule, __________.?
A. the hydrogen atom becomes partially positive
B. the electronegative atom becomes strongly positive
C. the hydrogen atom becomes partially negative
D. the oxygen atom becomes partially negative
The answers are A and D. The oxygen holds onto the electrons more of the time so is slightly negative, making H slightly positive and thus making a polar covalent bond.