Which statement about the origins of the American population is true?

The options are

a- most Americans decended from people who first populated the continent 20,000 years ago

b- most Americans are immigrants or the descendants of immigrants

c- more than other factor, high birth rate in the 1800s dramatically increased the American population

d- The American populations origins can be traced mainly to immigration from Asia in the twentieth century

The answer is b- most Americans are immigrants or the descendants of immigrants

Explanation:

Statistical data shows that about 25 percent of Americans descended from people who first populated the continent 20,000 years ago. The remaining 75 percent of Americans was as a result of immigration. This also makes immigration and not high birth rate a reason for population increase in the 1800 as there was a reduction in birth rate during that period. It is also false to say that American populations origins can be traced mainly to immigration from Asia in the twentieth century as Asian ethnicity doesn’t make up a majority of the population.

what are the options ?

this isn't a question and if you're going to list things be kind and use commas.