`NH_(3)` is more polar than `NF_(3)` because _________.

Options

A. F is more electornegative than H
B. `NF_(3)` has three lone pairs on each F atom
C. the orbital dipole due to lone pair on N is in same direction as the resultant dipole moment of N-H bonds in `NH_(3)`
D. the orbital dipole due to lone pair on N is in opposite direction as the resultant dipole moment of N-H bonds in `NH_(3)`

Answer

C