Two birds look morphologically similar but have different coloring. Although the birds have been found nesting together, they are not able to make viable, fertile offspring. How should these bird species

Two birds look morphologically similar but have different coloring. Although the birds have been found nesting together, they are not able to make viable, fertile offspring. How should these bird species be classified?

A) They are different species, despite their similar morphology.
B) They are members of different populations.
C) They are the same species, despite their different coloring.
D) They are the same species because they are geographically isolated.

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