Which Statement Concerning Solution Concentration Is TRUE

Which statement concerning solution concentration is TRUE?

A) A 1.0 ppm solution is more concentrated than a 1.0% (m/m) solution.
B) The ppm unit of concentration is typically used for very high concentrated solutions.
C) If a solution is 12% (m/m) it will also be 12% (m/V) .
D) If a bottle is labeled 0.10 M Ba(OH) ₂,the concentration of OH^- ions in solution is 0.20 M.
E) A solution that is 1 ppt is less concentrated than a solution that is 1 ppm.