If an atom has four electrons in the outer energy level, how will it form a bond? It will not form a bond.
It will gain electrons.
It will lose electrons.
It will share electrons.

B ) It will gain electrons

Explanation:

Atoms want to have 8 electrons, so it will need 4 more to be "happy"

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c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.