Which best describes the origins and spread of the bubonic plague in the 14th century?

a. it started in great britain and spread via sea routes to all corners of europe, including the north mediterranean.

b. it started in east india through disease-carrying camels and traveled via the trans-sahara salt trade.

c. it started in egypt, caused by squalid living conditions of egyptian slaves, and traveled throughout north africa.

d. it started in the mongol empire and spread via trade routes to all corners of asia and the middle east.