According to Tommie Shelby, What Is the Problem with Applying

According to Tommie Shelby, what is the problem with applying the "stipulative" approach to Garcia's theory of racism?

A) His theory would then entail that racism is not always wrong, and one of Garcia's requirements is that his project explain why racism is always wrong.
B) Doing so would make it too easy for Garcia's account to show that racism is always wrong (because the wrongness becomes a presupposition of his theory) .
C) His theory would only account for the history, structure, psychological mechanisms, and social consequences of racism, and thus would lack moral significance.
D) His theory would then entail that other "thick" moral concepts (e.g., "murder") ought to be revised via stipulation.