The correct options are
A Progressive ideas from the eastern parts of the Roman Empire spread to the western parts.
C Progressive ideas motivated people to question dogmas.
D People studied the works of Plato and Aristotle to learn new ideas and spread them across Europe.
The Crusades were a series of religious wars between Christians and Muslims from 1095 to 1291. During these years, progressive ideas of the Eastern Roman Empire reached the Western Roman Empire. Students learned new ideas in universities that challenged the dogmas and rigid thoughts. It opened new opportunities for independent thinking, which led to the Renaissance in Europe.