Which of the following was one result of large armies traveling great distances during the Crusades and helped contribute to the end of the medieval period?

I need the answers too because I’m taking a final right now:(

s the president shall be commander in chief of the army and navy of the united states, and of the militia of the several states, when called into the actual service of the united states; he may require the opinion, in writing, of the principal officer in each of the executive departments. sooo yeahhh

explanation:

d. she conquered the black sea coast and parts of poland.