Answer:
+4 is the correct answer.
Explanation:
Carbon's valence is +4. Six electrons are present in the carbon atom.
In the first valence shell, two electrons are present and in the outer valence shell of the carbon four electrons are there.
So, to complete the octet if carbon atoms four more electrons are required and carbon atom complete its octet by sharing its valence electrons with another atom.
Thus the valency of carbon atom is +4.
