Task: Instance Description Understanding (ontology: Sciences/Computer_Science)

Which of the following definitions best describes the instance 'mass percentage'?

A. A mass density unit which is equal to mass of an object in grams divided by the volume in deciliters.
B. A dimensionless concentration unit which denotes the mass of a substance in a mixture as a percentage of the mass of the entire mixture.
C. A dimensionless concentration unit which denotes the mass of the substance in a mixture as a percentage of the volume of the entire mixture.
D. A unit of molarity which is equal to one millionth of a molar or 10^[-6] M.

Answer: A dimensionless concentration unit which denotes the mass of a substance in a mixture as a percentage of the mass of the entire mixture.