To accommodate the view that matter is made up of $5$ elements only,a scientist proposed the following hypothesis: atoms can have a maximum principal quantum number $n_{\max}$ and no higher. Then,which of the following statements must be true?

• A
  $n_{\max} = 1$,and electrons have spin.
• B
  $n_{\max} = 2$,and electrons are spinless but nevertheless obey the Pauli Exclusion principle.
• C
  $n_{\max} = 3$,and electrons are spinless but nevertheless obey the Pauli Exclusion principle.
• D
  $n_{\max} = 4$,and electrons have spin.