Many whole families died when the plague hit Europe. Since the bite of a flea was the main transmission of plague, how did it MOST likely spread to the rest of the family?

A.
Every person would have to be bitten by an infected flea.

B.
The plague was passed through contaminated water and sewage.

C.
If the family were in close contact with the sick person’s boils, they could get the bacteria.

D.
If the plague had spread to the lungs and a person coughed, it could spread to others.