Which of the following molecules has a zero dipole moment?

Explanation

Tetrachloromethane has four polar carbon to chlorine bonds arranged symmetrically about the central carbon, so the four dipoles cancel exactly and the molecule is non polar overall. Water and ammonia are bent and pyramidal respectively, so their dipoles reinforce, and hydrogen chloride is a simple polar diatomic. Symmetry is the property to look for in this type of question.