Answer:
a. Solid
d. Liquid
c. Gas
Step-by-step explanation:
In the solid-state, we will have a larger amount of mass in a small amount of volume. If we remember the density equation:

Mass and density are directly proportional, therefore if we have more mass we will have more density. So, the highest density value most is solid-state. For the liquid state, we will have less mass in the small value, thus the density value that follows would be d. Finally, for the gas state, we will have more volume than mass, so the density value can be lower than 1, the value the follows d. is c. The gas state.