Scientists studying a group of related bird species on an island archipelago discover that these species are always more closely related to each other within an island than they are between any two islands. The most likely explanation for this result is that
A. many ancestral bird species colonized each island.
B. each bird species became reproductively isolated by living on a different island, then later colonized the other islands and acquired new adaptations.
C. each bird species evolved different adaptations in allopatry and then colonized the other islands.
D. one bird species colonized each island and then evolved into distinct species on that island through character displacement.
Answer: D
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