The purpose of the Lewis and Clark expedition in 1804-1806 was the first American expedition to explore the west, and map the newly acquired territory. They also wanted to find a practical route, and establish themselves. Studying the wildlife - plants, animals, etc - and establish trade with local indians was also an objective of the expedition!
The Petition was calling for a repeal of the Coercive Acts, such as the Stamp Act, which effectively imposed taxes on the inhabitants of the colonies. The best answer is D. although this might not be the best way to summarize this petition.
