4. The research experiments described in paragraph 20-23 ("But her most..."to "...success and failure.") suggest that My Prediction:Read A) people with a growth mindset are better equipped to learn new skills. B) it's difficult to change a child's mindset once it has been established. C) children need supportive and well-trained teachers to help develop a growth mindset. D) there is still much to be discovered about the role of attitude in learning