challenge: According to historical records, which indigenous groups inhabited the region of the São Paulo plateau?
  
  A. Several indigenous groups, including Tupi-Guaranys, Jés, and groups from the coast
  B. Only groups from the coast who sought refuge from wars and slavery
  C. Only Tupi-Guaranys and Jés
  D. Only Kaigang and southern Kayapó
  Answer: 