Why Did Chinese Immigrants Come to the United States in the Nineteenth

Why did Chinese immigrants come to the United States in the nineteenth century?

A) They were motivated by poverty and upheaval in southern China.
B) Chinese immigrants came to open laundry businesses in American cities.
C) The burgeoning population of China created widespread famine and shortages.
D) Chinese men sought jobs as indentured servants in the houses of rich Californians.