Why are many medieval poems anonymous?

a. historians don’t care about finding authors
b. the authors’ names were written in a different language
c. most poems were passed down orally
d. it was trendy to sign poems “anonymous.”

I'm going to say D.

Explanation:

A lot of poems then were signed "anonymous" because of a lack of documents from that period, but also because it was a trend to recreate classical poems and claimed they were handed down from an auctor (latin word for author). So the names of the people who re-wrote or embellished the original poems were not considered important.

"the sandy walls seemed to collapse in on themselves"

and

"the bloodshot waters seemed to have no bottom"