Octylphenol ethoxylate is a solute. The correct option is B.
Octylphenol ethoxylate is a detergent that is made up of ethylene oxide adduct of octylphenol. It is colorless and slightly hazed, and it can be solid or liquid.
A solute is a substance that is mixed with a solvent. It can be liquid or solid. The quantity of solute is always less than the solvent. Like salt and sugar. The mixture of a solute and the solvent is called a solution.
A solvent is a substance that dissolves a solute in it. Octylphenol ethoxylate is a solute because it is used as a detergent, and the detergent is mixed with water to form a solution.
Thus, the correct option is B, solute.
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