If a dark-colored, poisonous fish and a bird that can see only light-colored fish are added to the ecosystem in 2008, what will the graph likely look like in 50 years?

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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(A) (B) (C) (D) M