I would say that this problem needs more information. Giving only the concentration would not specify anything since in general salts are neutral as they are from neutralization reactions. Specifying other properties of the compound would be more helpful.
Archimedes law: the upwards force is equal to the volume of water replaced. So if you have a lot of volume, the boat will float. A boat can be made out of ANY material. Even gold
A & C should be the answer.
Answer:
Copper carbonate decomposes to copper oxide and carbon dioxide.
Explanation: