What law explains the relationships between different chemical compounds that contain only the elements carbon and oxygen?

I believe the answer in here would be the law of multiple proportions. The law states that whenever the same two elements merge to create more than one compound, the different masses of one element that merge with the same mass of the other element have a ratio that is in whole numbers.

law of multiple proportions

answer: any goods being imported from another country may be subject to issued by the federal government are tariffs

explanation:  

tariffs are a tax on anything that are imported from abroad. government use them to protect and boost their local industries and the thought is that they encourage consumers to buy local instead of importing and they will hope will protect jobs and economy in the country that implements them