Final answer:
The maximum number of electrons that can occupy one orbital is 2.
Step-by-step explanation:
The maximum number of electrons that can occupy one orbital is 2 (option B).
According to the rules for distributing electrons in an atom's orbitals:
- Each orbital can hold a maximum of two electrons.
- The orbitals are filled in the order of increasing energy, with the lowest energy orbital being filled first.
Therefore, the maximum number of electrons that can occupy a single orbital is 2.