Answer:
U-Boat (Unterseeboot)
Explanation:
During World War I, German Submarines played an essential role in the North Sea and the war. Germans were quite advanced when it came to controlling submarines. During the first World War, commander Franz Becker guided German submarines which we know today as U-boats. The Germans unrestricted submarine warfare tactics caused great offence to the merchant vessels in the waters around Great Britain particularly of the Royal Navy and America.
Answer:
b. Northerners felt slavery was an economic disadvantage to white people also.
Explanation:
It's obviously B, the other ones are true!
(p.s. also I just saw this randomly... I hope you get a good grade on your test lol)