The correct answer is A. The implied consent law states that by drivign a vehicle you have aggreed to submit to chemical tests of your breath, blood or urine to determine alcohol or drug consumption, when asked by a law enforcement officer.
I believe the answer is: Replication
During a replication, Researchers would repeat the research that conducted in the past, but being done with different situations or different type of subjects. The purpose of such research is to determine if the finding on the previous research would be applicable under different circumstances.
From what I can gather, the answer is either C. Many came to join family already in the United States, or D. Many were attracted by the opportunities to fight in the Civil War. (Sorry if it doesn't help).
To answer your question should be, B.