2. Make a natural layer of a green house gases surrounds the earth. It keeps the earth warm. From the book in the library, learn about the gases that forms this layer. What would have happened if the layer was not there? You can take help of various books or internet.

i'm assuming that the correct answer is indeed the first one/ "a"..

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.