Which of the following statements about the western plains in the 1870s is FALSE?

a. General Sherman was sent by the U. S. government to investigate reports of raids on the frontier.
b. General Sherman suspected that reports of raids were false.
c. The Salt Creek Raid led Sherman to believe that peace negotiations between the U. S. and Native Americans had failed.
d. Sherman continued his campaign to force Native Americans to reservations without seeing any evidence of raids.