In the Research by Blackwell, Trzeniewski, and Dweck Described in the Text

In the research by Blackwell, Trzeniewski, and Dweck described in the text, researchers created an educational program for low-income middle school students. Which of the following groups of children showed the most substantial improvement in math grades?

A) children who initially believed that intelligence is an unchanging quantity who were provided with information about how memory works
B) children who initially believed that intelligence is an unchanging quantity who were provided with information about how learning alters the brain
C) children who initially believed that intelligence improves through leaning who were provided with information about how memory works
D) children who initially believed that intelligence improves through learning who were provided with information about how learning alters the brain