The answer is B. If it were to cause anything, then it’d be the others, but it just prevents fuel from igniting at the wrong time.
The Sacco and Vanzetti case, the Red Scare, and the activities of the Ku Klux Klan all represent the fear of the spread of communism held by some Americans in the 1920's.
Answer: In search of homesteads, husbands, or other new opportunities.
The answer to this problem is true. The nation makes most of their money through the export of oil.