Four boxes (A–D) of identical volume each contain an aqueous solution of the same solute. Only the solute particles are shown; water molecules are omitted for clarity.
• Box A: 3 solute particles
• Box B: 5 solute particles
• Box C: 2 solute particles
• Box D: 7 solute particles
Which box contains the most concentrated solution?
a) Box B
b) Box A
c) Box D
d) Box C