The results of the various expeditions exploring the Texas area from 1528 to about 1543 convinced ...

The results of the various expeditions exploring the Texas area from 1528 to about 1543 convinced Spanish officials that __________.
 
  A. the Texas area was a potentially rich region for colonization
  B. the indigenous people in that region were more sophisticated and advanced than the Aztecs and other Indians in central Mexico
  C. the area was not promising and that their efforts would be more profitable if directed to other parts of the New World
  D. the French had already begun to establish an empire there and would resist Spanish colonization