Question

1. why did genghis khan attack and destroy the muslim cities to the west?

because they did not respect him
because he wanted to take control of the silk road trade route
because he wanted to destroy the muslim religion
because they killed the members of a mongol trade delegation
he had no reason

Explanation:

Genghis Khan's attack on western Muslim cities was triggered when the Khwarazmian Empire executed a Mongol trade delegation and its accompanying caravan, violating diplomatic and trade norms he had established. While control of the Silk Road was a broader strategic goal, the immediate and direct cause was the killing of the trade delegation.

Answer:

Because they killed the members of a Mongol trade delegation