The correct answer is A. A bacterium caused the Black Death
Explanation:
The Black Death was a pandemic during the 14th century responsible for reducing the population of Europe, Asia, and even part of Africa. During the time this occurred people considered the disease was caused by God or it was related to the alineation of planets because this disease was not studied scientifically during the time it occurred. However, during the end of the 19th century, it was determined by a group of scientists in Hong Kong that this disease was caused by a bacterium known as Yersinia Pestis and the bacterium had been spread through rodents. According to this, the correct answer is A.
