Answer:
A. The printing press caused medieval Europeans to think differently about religion, art, and philosophy.
Step-by-step explanation:
Looking at our answer choices (and using the cause-and-effect diagram), we can quickly eliminate D because it was actually the other way round. B is also gone because the printing had a MUCH more serious impact that what B says. This leaves A & C as our choices. C is gone as well because the diagram doesn't really say anything (but rather, indicates (without any words)) that the printing press was important. As a result, A is our answer.