What is not a reason lewis and clark were sent on there expedition a) to look for gold and silver b) establish trade relations with the native americans c) strengthen the united states claim to the lands in the northwest d) scientific research

I believe it is A. I know for sure that B and C were reasons for exploration. I think D is also since they recorded anything new in their journals and made maps, so I think it would have to be that they didn't search for gold or silver, A.

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