Spain was a very Catholic state and Phillip II thought of himself a champion of Catholicism, so the Catholic Church played a major role in Spain's American empire. Church officials were royal advisors and the church also sent missionaries to convert natives to Catholicism and help regulate the activities of the settlers.
With the exception of the last sentence, all sentences are fluidly written and clearly connected between each other. In the case of the last example, the lack of transitional phrases between the two sentences creates a disconnection between the concepts expressed. While we might still be able to understand these sentences, we need to make the transition happen for ourselves as it was not included in the example.
Therefore, your best answer is option D.
Yes, back then thousands of years ago everyone traded to get what they are needed.
