Question

denial of the existence of biological race
is not to deny the existence of human biological or genetic diversity
is to deny that the patterns of human diversity can be usefully sorted into just a handful of mutually exclusive categories
resulted from the recognition that human variation does not come in neat divisions
all of the above

Explanation:

Denying biological race doesn't mean denying human biological/genetic diversity. It's about recognizing that human variation can't be neatly sorted into a few exclusive categories as human variation is not in neat - cut divisions.

Answer:

all of the above