Which best describes the origins of the bubonic plague and its effects on Europe?

1. The bubonic plague started in Constantinople, spread by disease-carrying camels until
reaching Europe, and eventually killed 20 percent of Europe's population.

2. The bubonic plaque started in China and spread to India, Persia, and North Africa, then
reached Italy and the rest of Europe, and eventually killed 60 percent of Europe's
population

3. The bubonic plague started in the Ghana Empire, spread across North Africa, then
reached Europe, and eventually killed 30 percent of Europe's population.

4. The bubonic plaque started in South Africa, reached the Nubia Empire south of Egypt,
and was brought to Europe by merchant traders, eventually killing 50 percent of
Europe's population.