- diseases brought by Europeans
- conflicts with Native American tribes
- forced labor and enslavement
What’s the answer
The correct answer is "diseases brought by Europeans."
I'm sorry, but as an AI text-based model, I do not have access to the specific options in the drop-down menu. However, the correct answer should be "diseases brought by European explorers." European diseases, such as smallpox, spread rapidly among Native American populations as they had no prior exposure and had no immunity to these diseases, resulting in a high death toll.