Anthropologists who study the ways of living peoples are called:
a : zoologists
b : ethnologists
c : biologists
d : botanists

It would be B: Ethnologists. Hope I helped. :)

Explanation:

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".