1. PART A: Which of the following best identifies the central idea of
this article?

A: Lewis and Clark set out on their journey with hopes of becoming famous.

B: Lewis and Clark made an important trip west to help create one of the earliest maps of the United States.

C: The only goal of Lewis and Clark‘s journey was to discover the location of the Missouri River and where the River ended.

D: Before they begin their journey, Lewis and Clark used maps of the western United States to decide the best route to take.