Because Walt Whitman is free verse poetry do not follow the condo conventional rules of poetry it was

i think its d, but grammarly says none

explanation:

the development of trade during the middle age increased to the change given in the agriculture, which gave money, industry and markets a bigger importance in economy. the agriculture production was more than the consumption, which meant the creation of wider markets out of the areas. besides, with the end of multiple wars, the population increased and new trade routes were created.

try