Final answer:
The assumption often made about Plymouth Plantation's early history is that the early settlers faced extreme hardship and challenges.
Step-by-step explanation:
The assumption often made about Plymouth Plantation's early history is D) The early settlers of Plymouth Plantation faced extreme hardship and challenges.
The early settlers of Plymouth Plantation indeed faced numerous challenges and hardships. They arrived too late in the season to plant crops and had to rely on the help of Native Americans for survival. Additionally, they had to endure harsh winters, food shortages, and diseases. Overall, their early years were marked by significant struggles.