Final answer:
Francisco 2. Pizarro was a Spanish explorer, but Vasco Núñez de Balboa was not.
Step-by-step explanation:
Francisco Pizarro was a Spanish explorer who participated in successful expeditions in Panama and later led the capture of the Inca emperor Atahualpa.
Therefore, he was a Spanish explorer. On the other hand, Vasco Núñez de Balboa was not a Spanish explorer but a Spanish conquistador and the first European to see the Pacific Ocean from the Americas. So, the correct answer is 2) Pizzaro.