The ionization energies of chlorine and hydrogen are $1256$and $1311$ $\mathrm{kJ}/$ mole respectively. Hydrogen forms ${\mathrm{H}}_{\text{(aqueous) }}$ ion, but chlorine does not form ${\mathrm{Cl}}^{+}$(aqueous) ion, because

 We know that ${\mathrm{H}}_2$ and ${\mathrm{Cl}}_2$ both are atoms, and the ionization energy of chlorine is $1256$ $\mathrm{kJ}/$ mole and of hydrogen is 1311 $\mathrm{kJ}/$ mole. Which is greater than chlorine, but hydrogen is small in size that's why H-H bond breaks easily and the Polar${\mathrm{H}}_2\mathrm{O}$ molecule watered into and provides ${\mathrm{H}}^{+}$(aq), and chlorine is bigger in size that's why its ionization energy is less that's why chlorine does not form ${\mathrm{Cl}}^{+}$(aqueous) ion.

Hence, option(b) is the answer.