Question

how did most historians think the bubonic plague spread?
fleas on rats
alignment of the stars
bad water
looking at people

Explanation:

Most historians and scientific researchers agree that the Bubonic Plague (Black Death) was primarily spread by fleas that lived on black rats. These fleas carried the Yersinia pestis bacterium, and when rats infested human settlements, the fleas would bite humans, transmitting the disease. The other options are incorrect: star alignment was a medieval superstitious belief, bad water is linked to waterborne diseases like cholera, and "looking at people" has no basis in disease transmission science.

Answer:

Fleas on rats