Which of the following theories is supported by the evidence?
(A) The pigment trait in fish demonstrates incomplete dominance.
(B) The pigment trait in fish demonstrates classical dominance.
(C) The pigment trait in fish demonstrates codominance.
(D) None of the above

A population of goldfish in a large, isolated pond were studied in 1958 and again in 2008. The fishes' pigment level varied from pale white-orange fish to dark brown orange fish. The color of each of the fish was recorded in the figure below.

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Number of Fish 1958 Goldfish Phenotype Distribution Light pigment Dark pigment