PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!
Which of the following below best describes the impact of fur traders on the Pacific Northwest?

A. all of the above

B. Their forts became the first settlements as a focus on self-sufficiency lead to agricultural and mill pursuits

C. Their storehouses were the first outpost stores, providing supplies for fur traders, settlers and Native Americans

D. Their journeys built up a detailed picture of the region's geography