All of the following groups and persons provided critical logistical h

All of the following groups and persons provided critical logistical help, food, shelter, and/or geographical knowledge to Lewis and Clark during the course of their expedition EXCEPT

A) the Shoshone Indian guide, Sacagawea.
B) the French trapper, Toussaint Charbonneau.
C) a party of Nez Perce Indians in the western Rockies and a leader of Nez Perce Indians called Twisted Hair.
D) British army soldiers posted in forts in Canada and the Oregon Territory.

ANSWER
Answer: D