Question

new evidence changed ideas about what caused the black death when a team of scientists visiting hong kong discovered that

a bacterium caused the black death.

a virus caused the black death.

rabies caused the black death.

tetanus caused the black death.

Explanation:

The Black Death (bubonic plague) is known to be caused by the bacterium Yersinia pestis. The discovery in Hong Kong related to the cause of the Black Death identified that a bacterium was responsible. A virus, rabies, and tetanus are not the causes of the Black Death.

Answer:

A. a bacterium caused the Black Death.