The correct answer is A. Coronado.
Step-by-step explanation
Francisco Vazquez de Coronado was a Spanish conqueror who traveled from Spain to the Viceroyalty of New Spain (now Mexico) and some areas of the United States. He led an expedition that began in February 1540, during May of the same year he reached the Gulf of California and in August they found the Colorado Canyon and the Rio Grande. This expedition lasted about two years and traveled a total of 7,000 miles across the southwestern United States. So, the correct answer is A. Coronado.