I believe the answer is the one you picked as in on a schoolgirl on holiday
I believe that it is C) Government Opposition.
Answer:
Problems with the Catholic Church in the 1500s (the church nowadays has problems too, but this is the easiest time to write about.) - corruption, clergy, indulgences, salvation of power, so did the Pope in Rome. Since he was in charge of the Church, he was also in charge of who was baptized, married, and more. The kings and queens knew this, so they would ask him for his opinion and give him fancy gifts.
Explanation:
The most common barriers to trade are tariffs, quotas, and non-tariff barriers