I think B is the best answer but I am very sorry if it is wrong
Answer:Thomas Jefferson was the third president of the United States. He served two terms in office, from 1801 to 1809.
Jefferson dealt with two major challenges to US authority: piracy along the Barbary Coast of North Africa, and British impressment, which resulted in Jefferson instating a mass embargo of European goods, the Embargo Act of 1807.
Jefferson authorized the Louisiana Purchase, which effectively doubled the territory of the United States.
Explanation:
D. it has been improved by having unwanted substances removed