The correct answer is B. Drastic reduction
Step-by-step explanation:
The Native American population was widely affected by the arrival of settlers during the 16th century (1500), indeed the population of Natives in all the American continent reduced during this time for multiple factors including conflicts and wars between native people and settlers, forced displacement of native people, enslavement of native population and diseases such as chickenpox or measles brought from Europe. Indeed just in the U.S. by the 1900 many tribes had disappeared and those remaining it is estimated represented only %20 of the initial population or even less. Thus, from 1500 to 1900 the Native American population experienced a drastic reduction.