The craftsmen in the play speak in prose because

A. too much blank verse gets tiresome.

B. it's the language of love.

C. Theseus would have forbidden them to use verse.

D. that kind of common language symbolizes their status in life.

I believe the correct answer is D) that kind of common language symbolizes their status in life. Because no craftsman would speak very posh and elevated language of poetry, therefore they speak in prose, which is not that classy, so to say.