The correct answer is option B, The solute molecules are carried into the solution
Explanation:
When a solute is added to a solvent it dissolves in it by occupying the space between the atoms/molecules of the solvent. This space between the atoms/molecules is called interstitial space. For example - when sugar(solute) is added to water (solvent), the atoms of sugar occupies the space between the molecules of water and thus the sugar dissolves without increasing the volume of the solution.