Electrons orbit around the nucleus in these

Electrons orbit in orbitals (s, p, d, f).
Technically, the number of orbitals extend to infinity, but the effective nuclear charge decreases as the distance increases.

There is one s orbital, and there are three p orbitals, five d orbitals, and seven f orbitals. thus, the answer is b. do not confuse the number of orbitals in a subshell with the number of electrons the subshell can hold. each orbital can hold two electrons, so the capacity of an nf subshell is 14 electrons.