Based on research, it has been determined that the human circadian rhythm appears to be just over 24 hours.
Circadian rhythms are physical, mental, and behavioral changes that follow a 24-hour cycle.These natural processes respond primarily to light and dark and affect most living things, including animals, plants, and microbes.
One example of a light-related circadian rhythm is sleeping at night and being awake during the day.
Circadian rhythms can influence important functions in our bodies, such as: hormone release , Eating habits and digestion and Body temperature.
However, most people notice the effect of circadian rhythms on their sleep patterns.
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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).
The explanation above is correct!