HeLp Me!! Select the sentence from the article that BEST explains why Lewis and Clark's return journey was long and difficult.
(A) Clark claimed that the Chinookans stole his pipe and a coat.
(B) The explorers also failed to understand what lay behind the Chinookans' thieving.
(C) Progress was slow as the expedition made its way upstream, pushing against the current.
(D) Traveling east, Lewis and Clark became increasingly frustrated by the people who lived along the lower
Columbia.