Which of the Following Was an Aim of the Lewis

Which of the following was an aim of the Lewis and Clark expedition?

A) to discover the source of the Mississippi River
B) to explore the economic potential of the territory acquired through the Louisiana Purchase
C) to secure expanses of land for Indian reservations west of the Mississippi River
D) to bring needed supplies to military forts along America's new western border
E) to order Spanish traders out of the territory acquired through the Louisiana Purchase