Under which of the following conditions will speciation not occur?

ALogging operations in a forest cut a single population of beetles in two so that they can no longer mix.

BSome snails in a population develop shells that twist to the right instead of the left, which makes mating impossible with partners of opposite shell shape.

CA newly constructed housing development divides the habitat of a bird species in two, forcing the birds to fly from one section to the other

DSome females of a species of spider prefer to mate with males that have red markings while other females prefer