Question

how were the mongols involved with the spread of the black death?
the mongols took up agriculture as a way to avoid spreading the plague.
the mongols opened up trade paths, which brought infected fleas on rats to europe.
they spread the disease intentionally, as a kind of biological warfare.
they killed whole towns of people who had the plague.

Explanation:

The Mongol - controlled trade routes, like the Silk Road, allowed for the movement of goods and people. Rats carrying infected fleas were able to travel along these trade paths and reach Europe, contributing to the spread of the Black Death. There is no evidence for the Mongols taking up agriculture to avoid spreading the plague, using the disease as biological warfare, or killing whole plague - ridden towns.

Answer:

The Mongols opened up trade paths, which brought infected fleas on rats to Europe.