Final answer:
The writer's opinion about Cabeza de Vaca's admiration is not mentioned in the passage.
Step-by-step explanation:
The writer's opinion about whether they find Cabeza de Vaca admirable is not mentioned in the passage. There is no explicit statement indicating that the writer finds Cabeza de Vaca admirable or not. Therefore, the correct answer is c) The writer's opinion about Cabeza de Vaca's admiration is not mentioned in the passage.