How was the black plaque spread from Asia to Europe

Explanation:

The medieval Silk Road brought a wealth of goods, spices, and new ideas from China and Central Asia to Europe. In 1346, the trade also likely carried the deadly bubonic plague that killed as many as half of all Europeans within 7 years, in what is known as the Black Death. Later outbreaks in Europe were thought to have arrived from the east via a similar route. Now, scientists have evidence that a virulent strain of the Black Death bacterium lurked for centuries in Europe while also working its way back to Asia, with terrifying consequences.

The medieval Silk Road brought a wealth of goods, spices, and new ideas from China and Central Asia to Europe. In 1346, the trade also likely carried the deadly bubonic plague that killed as many as half of all Europeans within 7 years, in what is known as the Black Death.

I got this from the internet, I know how it happened, but I can't word it right, but I can say this-Rats were brought in(accident) and that's what carried the disease.

answer; i believe that the correct answer is (c) arctic tundra;