Because the rise of merchants weakened the power of monarchs making the peasants leave their manors for towns where they could find work. Also, agriculture stopped being profitable bec merchants imported food so there was no more need for agriculture
Greece is very hilly so it was hard for the ancients greeks to farm the land and use crops as a main source of food so instead they use sea food as a main source of food since they are sorounded by the ocean.
It would be that "d. They refused to baptize native converts into the Christian faith", since the Spanish viewed this as a way of solidifying their efforts of religious conversion.
