Answer:
Manco has been crowned as a ''puppet'' emperor because Pizarro believed he could boss Manco around.
Step-by-step explanation:
The first option is not correct because if Pizarro was on that opinion he simply wouldn't have attacked and conquered the Inca Empire.
The second option is not correct because Pizarro didn't really care who was the more capable king, but he looked at which one would serve his interests the best.
The third option is not correct because Pizarro managed to get pretty much everything that the Incas had, primarily gold and silver that were in his interest.
The fourth option is correct because Pizarro crowned Manco as an emperor with the purpose to give a false impression to the Incas that they still have their own emperor, while he is pulling the strings from behind the scene.