Answer:
Outgroup favouritism.
Explanation:
This is the preference for outgroups over ingroups.
That is, Jennifer is showing preference over those who don't belong to her group.
"Earlier, I heard Jacob say that you are very Creative."
-Edited-
It decreased and very significantly so!
Most of native Americas died of diseases brought by Europeans; but some were also killed directly by the Europeans. Many also mixed with the Europeans (by marriage or rape...) so there was also a mixed indigenous-white population.
ps. C and D is essentially the same answer