A combination of paper chromatography and electrophoresis involvesSelect one:a.electrical mobility of the ionic speciesb.none of the given optionsc.partition chromatographyd.Size exclusion

The correct answer is a. electrical mobility of the ionic species.

This is because both paper chromatography and electrophoresis are techniques used to separate mixtures. Paper chromatography separates substances based on their different affinities for the paper (stationary phase) and the solvent (mobile phase). On the other hand, electrophoresis separates substances based on their different rates of movement in an electric field, which is determined by their size, shape, and charge. Therefore, the combination of these two techniques would involve the electrical mobility of the ionic species.