Why didn’t people during the Middle Ages care that much about the world around them?

A. None of them had families, so their lives were pretty boring.
B. They didn’t think this world mattered – they were only focused on what their lives would be like in heaven.
C. Their brains weren’t very developed, so they weren’t really able to experience deep emotions about anything.
D. They all believed that what mattered most was what they learned from dreams while they were sleeping.