For equal volumes, measures of mass of different substances differ.

The correct option is A True

1. The mass of the substance is dependent on the density and volume of the substance.
2. The substance having the same volume might have different mass because they have different densities.
3. For example, the mass of iron is much more than the mass of an equal volume of wood. This is because the particles of iron are more closely packed than those of the wood. In other words, iron is denser than wood.
   

Hence, the given statement is true.