Answer: A: The particles that make up material A have more mass than the particles that make up material B.
Step-by-step explanation:
The density of a material changes when it changes phases of matter (gas, liquid solid). Its mass does not change because its particles do not disappear - they are just rearranged and occupy a different volume. Density =
. A greater volume would mean the density decreases, a greater mass would mean the density increases. Because it is in the denominator, decreasing the volume would also increase the density.