Final answer:
The Dunning-Kruger effect teaches us that we should be cautious when assessing our expertise in any area, especially in a new area of learning. There is always room for improvement in our skills and knowledge.
Step-by-step explanation:
The Dunning-Kruger effect teaches us that we should be cautious when assessing our expertise in any area, especially in a new area of learning. Research shows that people tend to overestimate their knowledge and skills when they are not yet experts. It takes time to develop mastery in a subject, and even experts recognize that there is always room for improvement. Therefore, the correct answer to the question is B) There's always room for improvement.