The correct answer is:
b. they became aggressive after having a new religious view upon them
Ferdinand Magellan was a Portuguese explorer who organised the Spanish expedition to the East Indies from 1519 to 1522, reach the Philippine archipelago, and spread the religion Roman Catholicism. The native population, some of their chiefs were in agreement with the conversion, but some of them like "Lapu-Lapu" opposed to the decision. They became agressive because this opposement led to a war afterwards.