What happens to the blood which reaches the cells from the capillaries?
food and co2 pass to cells, o2 pass to blood
wastes and co2 pass to cells, o2 pass to blood
co2 and o2 pass to cells, wastes pass to blood
food and o2 pass to cells, co2 and wastes pass to blood

The blood the reaches the cells from the capillaries food and O2 pass to cells, CO2 and wastes pass to blood. The rest of the choices do not answer the question above.

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.