Answer:
B) He explored mush of what is now Texas.
Step-by-step explanation:
A) Incorrect, because Hernán Cortés defeated the Aztecs.
B) Correct, because Cabeza de Vaca was shipwrecked near Galveston Island and set out to explore Texas, nine years after Alonso Álvarez de Pineda discovered it.
C) Incorrect, because Alonso Álvarez de Pineda wrote the first historical document related to Texas and is credited with discovering it.
D) Incorrect, because Hernando de Soto was the first European to explore the Mississippi River.