Remember that most compounds of alkaline earth metals do not dissolve easily in water. What is the white solid that formed when washing soda (sodium carbonate) was
added to the solution of magnesium sulfate?

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  

i think it's letter a.