The element that has six valence electrons is sulfur (S), which is part of Group 16 (or VI A) of the periodic table.
However, this isn't one of the options you've provided.
Among the options given:
- Phosphorus (P) has five valence electrons.
- Oxygen (O) has six valence electrons.
- Lead (Pb) has four valence electrons (as it is in Group 14).
- Carbon (C) has four valence electrons.
So from your options, the correct answer is oxygen (O).