Ahistorian is researching how jazz music evolved in the united states in the early twentieth century as a result of the intermingling of african american and european music traditions. which two works by other historians will the historian most likely use to develop a hypothesis on this topic?
a) a research paper by a social historian that describes and analyzes african american pop culture in the early twentieth century
b) a research paper by an economic historian that presents evidence showing a huge difference in the income levels of african americans and white americans in the early twentieth century
c) a research paper by an economic historian that presents evidence that a high percentage of african americans were uneducated and jobless in the early twentieth century
d) a research paper by a cultural historian that analyzes different jazz styles and how they developed