For the nitrogen atom ($Z=7$) the correct distribution of the three $2p$ electrons in the ground state is

1. Aone electron in each of the three $2p$ orbitals, all with parallel spins
2. Btwo electrons paired in one $2p$ orbital and one in a second $2p$ orbital
3. Cthree electrons in one $2p$ orbital
4. Done electron in each $2p$ orbital with antiparallel spins