1. Which sentence contains an error in subject-verb agreement?

A. Many citizens of Clarkson County are fighting to save the local wetlands.

B. Each of the athletes have trained hard for the competition.

C. Macaroni and cheese is being served in the cafeteria today.

D. My mother or my father is going to pick me up from swim practice.

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.