How does the author’s introduction (Paragraphs 1-4) contribute to the author’s explanation of the Black Death?

A
It emphasizes how severely the bubonic plague affected people and how quickly it killed them.
B
It reveals how the bubonic plague was able to enter Europe without anyone knowing until it was a full pandemic.
C
It shows how closely crowded spaces caused the disease to spread more quickly, especially near bodies of water.
D
It suggests that Europe could have easily avoided the plague if they had not let the ship in to the port.