<span>He sang spirituals to Antonin Dvorak. At that period, Dvorak was in charge of the orchestra at the National Conservatory which had African –American men from St.Philips as part of it. Burleigh played the double bass and the tympani and assisted Mr. Antonin Dvorak. Both men developed a great relationship. Burleigh having learnt old plantation songs from his grandmother, which were later regarded to as spirituals, would sing to Mr.Antonin Dvorak after supper when Dvorak was tired.</span>
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I want to say the answer your looking for is option C. But not 100% sure.
Answer:
The diffusion of crops and pathogens, including epidemic diseases like the bubonic plague, often occurred along trade routes.
The bubonic plague - named the Black Death by later historians - was caused by the Yersinia pestis bacteria, which lived in rodent populations and was spread by fleas that had bitten infected animals.
Once the plague transferred to animals that were in close contact with humans and to humans themselves, it began to spread along established trade routes.
It is difficult to measure the exact human cost of the plague due to limited records from the historical period.
Most historians think that the plague killed somewhere between 30% and 60% of Europe’s population between 1347 and 1351.
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