It can be inferred from the passage that a predominantly sinistral snail species might stay predominantly sinistral for each of the following reasons EXCEPT for A. a developmental mechanism that affects the cell-division pattern of snails B. structural features that advantage dextral snails of the species C. a relatively small number of snails of the same hand for dextral snails of the species to mate with D. anatomical incompatibility that prevents mating between snails of opposing hands within the species E. geographic separation of sinistral and dextral populations