Which of the Following Is Not Included in the List

Which of the following is not included in the list of criteria that Taper and Case believe must be met to build a definitive case for character displacement?

A) Morphological differences between a pair of sympatric species are statistically greater than the differences between allopatric populations of the same species.
B) The observed differences between sympatric and allopatric populations have a genetic basis.
C) Variation in the character must have a known effect on the use of resources.
D) There must be demonstrated competition for the resource under question and competition must be directly correlated with similarity in the character.
E) All of the choices are included in the list of criteria that must be met to build a definitive case for character displacement.