The answer to this would be stalking.
The answer to the question stated above is: letter D The impact of European colonialism in the Americas similar to its impact on Africa from the fifteenth to eighteenth centuries is that Colonialism resulted in widespread deaths from disease in both locations.
Assuming that this is referring to the same list of options that was posted before with this question, the correct response would be through a "mutual understanding," since this was the purpose of the Berlin Conference.
It's either C or A, but I think it's A.