Answer : The correct option is, (A) solvent
Explanation :
Solvent : It is present in large amount. It is a type of substance in which the amount of solute is dissolved.
Solute : It is present in smaller amount. It is a substance that is dissolved in another substance.
Emulsifier : It is a molecule that has two ends, one is water loving end and another is oil loving end. That means it is a substance which stabilizes the emulsion.
Hence, the term for the dissolving medium in a solution is, solvent.
