Select the sentence that best states the main idea of the paragraph. The bubonic plague was one of the most horrific events in world history. It started in Mongolia and was caused by tiny bacteria. The bacteria infected fleas, and the fleas that carried the germ jumped onto rats and then quickly spread. From the first landing in Sicily, the plague spread throughout Italy and then moved all across Europe People bitten by fleas developed high fevers and terrible, painful swellings on their bodies Sufferers died quickly and in huge numbers An even worse form of the plague was airbome passing from person to person through their breath This form of the disease killed even more people and killed them faster.