Which of the following set of molecules will have zero dipole moment?

1. A. Boron trifluoride, hydrogen fluoride, carbon dioxide, 1,3-dichlorobenzene
2. B. Nitrogen trifluoride, beryllium difluoride, water, 1,3-dichlorobenzene
3. C. Boron trifluoride, beryllium difluoride, carbon dioxide, 1,4-dichlorobenzene
4. D. Ammonia, beryllium difluoride, water, 1,4-dichlorobenzene

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