In a solution, which pair of actions could combine to keep a concentration constant? A. adding solute, then evaporating water

B. adding water, then adding solute

C. adding water, then removing solution

D. adding solute, then removing solution​

B: Adding water, then adding solute

Explanation:

This is because, say you have a solution with a certain concentration.

If you add more water, it will become more diluted (less concentrated)

If you add more solute, it will become more concentrated.

Therefore if you add water and solute, it could cancel out, and the concentration would remain the same.

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