Which solution is the most concentrated?

2.0 ml of 10 m h2so4, where h2so4 has a molar mass of 98 g/mol
5.0 ml of 1.0 m pbso4, where pbso4 has a molar mass of 303 g/mol
2.0 ml of 10.5 m h2o2, where h2o2 has a molar mass of 34 g/mol
100 ml of 10 m nacl, where nacl has a molar mass of 58 g/mol

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.