The answer is D because answers A, B, and C are simply spreading American culture throughout America, thats not cultural diffusion by any means.
Answer: It was the main cause of death in the 1200s
Explanation:
A.It affected people in Africa, Asia, and Europe option does make sense, but it doesn't best describe the bubonic plague.
B.It started in Europe and spread to Asia. True, but still doesn't really explain the bubonic plague
C. It was the main cause of death in the 1200s, that sums it up the best, the world's population declined by almost half during the plague, so it describes it the best.
D. It literally makes no sense and completely false, they used this method to get rid of bodies since so many people were dying.
This historian would be using "research skills" at this stage of the process, since he or she has yet to determine all the facts, and therefore is unable to yet form a thesis.
