Assuming the compounds to be completely dissociated in aqueous solution, identify the pair of the solutions that can be expected to be isotonic at the same temperature:
(A) \(0.01 \mathrm{M}\) Urea and \(0.01 \mathrm{M} \mathrm{NaCl}\)
(B) \(0.02 \mathrm{M} \mathrm{NaCl}\) and \(0.01 \mathrm{M} \mathrm{Na} \mathrm{SO}_{4}\)
(C) \(0.03 \mathrm{M} \mathrm{NaCl}\) and \(0.02 \mathrm{M} \mathrm{MgCl}\)
(D) \(0.01 \mathrm{M}\) Sucrose and \(0.02 \mathrm{M}\) glucose