Question: What co-educational college-preparatory school is located in the same state that Mary Richardson Walker's parents were from?
Sentence (from "Tshimakain Mission"): On April 23, 1838 after traveling to Independence, Missouri, the Eells, Walkers, William Henry and Mary Augusta Gray, Asa B. and Sarah Smith, and Andrew Rodgers, departed for the Oregon County with a Hudson Bay Company fur trader caravan to the Rendezvous.
Relevant evidence: No