In the Following Paragraph, What Constitutes the Grounds

In the following paragraph, what constitutes the grounds?

A) One of the most stunning findings in all the work on creativity is this…
B) There are not a lot of innate differences between people who are creative and people who are not.
C) Runco argues that everyone has creative potential, in that everyone is capable of transforming
The physical world through their interpretations and that everyone has the ability to decide when
Those interpretations are useful or not.
D) None of these are grounds.