Final answer:
The correct completion for the sentence is C. change, emphasizing that altering a fixed mindset is difficult but achievable with the development of good habits of mind and reflective practices.
Step-by-step explanation:
The student is asking about how it might be difficult to change a fixed mindset because old habits of thinking are hard to alter, but confirms that change is indeed possible. The correct answer to fill in the blank is C. change, indicating that while it may be challenging to alter a fixed mindset, it is an achievable goal. Developing good habits of mind is essential, as they allow an individual to engage in critical reflection and metacognition to combat cognitive biases. Strategies such as modeling attitudes of respected individuals, reflecting on one's thinking processes, and taking a rational approach to altering behaviors can facilitate the shift from a fixed mindset to a growth mindset.