Why Does Thomas Think That Merely Changing Belief Is Insufficient

Why does Thomas think that merely changing belief is insufficient to eliminate bias from hiring decisions?

A) Changing beliefs is insufficient to eliminate bias from hiring decisions unless those in charge of hiring decisions themselves have sincere beliefs in equality.
B) Changing beliefs does not eliminate bias from hiring decisions because the most qualified candidates could still be white men and result in a faculty that lacks diversity.
C) Since changing beliefs is impossible when they are so deeply ingrained and entrenched in society, the only option is to wait until racist and sexist people die out.
D) The sincere belief in equality does not necessarily lead to a change in attitude and feelings in everyday interactions and does not eliminate residual and unintentional attitudes of racism and sexism.