I think it the new york campaign
Answer:
Through interaction between traders and the locals along the trade routes.
Explanation
During their trades operation, a lot of interaction happened between the traders and the local people. During those interaction, they started to learn about each other's religion, culture, scientific development in their hometown , etc.
This is where the locals learn about the religion of the traders. After the traders left, the locals will spread the knowledge about that religion to other locals and contributed to the increasing amount of followers of that religion.
This is your own opinion. You can’t get a question wrong if it is an opinion. If your teacher/professor takes points off a question that is your own opinion you can contest it because your teacher would be using bias against your answer. Which teachers can’t do
