If the individual bond dipoles cancels each other, the molecule is nonpolar, with zero dipole moment. If the individual bond dipoles do not cancel each other, the molecule is polar, with non-zero dipole moment.

Which of the following has zero dipole moment?

Trans-dichlorobenzene has zero dipole moment as it is symmetrical and the dipole moment will cancel out.

Which species has zero dipole?

Carbon tetrachloride and tin tetrachloride have tetrahedral structure and zero dipole moment because all the bond dipoles cancel each other which gives net dipole moment zero. Carbon dioxide has zero dipole moment but the structure is not tetrahedral.