Habitat for Humanity is a non profitable Christian organization that builds homes for the homeless through the use of volunteer labor. Their mission statement is "Seeking to put God's love into action, Habitat for Humanity brings people together to build homes, communities and hope".
C. is correct for Humphreys collecting data for the Tearoom Trade study under the pretense that he was a lookout is an example of a violation of the principle of:
I'd say either railroads or wagon trains because airplanes and steamboats are not land travel and wagon trains are a vehicle and railroads are a thing they ride on to guide them
