L, M and N are three distinct elements from Period 3 of the Periodic Table. L is the element whose atoms contain three unpaired electrons in its $3p$ sub-shell. M is the element that has the greatest electrical conductivity in the period. N is the element with the greatest melting point in the period. Which statement about element L is correct?
- AL has a higher atomic number than M and a lower atomic number than N.
- BL has a lower atomic number than M and a higher atomic number than N.
- CL has a lower atomic number than both M and N.
- DL has a higher atomic number than both M and N.