James created a salt water solution by adding a scoop of the solute, salt, to a beaker of the solvent, water. After all the salt dissolves, James places the beaker of salt water on a hot plate and begins to heat the solution. After half of the water evaporates, the concentration of the solution has
A) increased.
B) decreased.
C) stayed the same.
D) It is impossible to tell without measuring.
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