Question

by 1900, about 100,000 immigrants living in the united states were from china. africa. italy. germany.

Explanation:

By 1900, a significant number of immigrants from China were living in the US due to factors like the California Gold - Rush and railroad construction. African immigrants were not in this scale at that time for reasons such as restrictive laws and historical context. Italian and German immigration numbers were different in nature and scale compared to Chinese immigration around 1900.

Answer:

A. China