It was the Japanese Americans. This is because Japan bombed Pearl Harbor in America, which made Americans suspicious of the Japanese Americans.
Hope this helped. Lmk if you still have a question or this explanation wasn't clear enough. :-)
A) Henry Ford is known as the father of the modern assembly line.
Because of this invention, the Ford Model T was inexpensive and was extensively bought by the middle-class people
hope this helps
C) European leaders staked out their claims in Africa during the Berlin Conference