The observation that island D. yakuba are more closely related to mainland D. yakuba than island D. yakuba are to D. santomea is best explained by proposing that D. santomea _____
A) descended from a now-extinct, non-African fruit fly
B) arrived on the island before D. yakuba
C) descended from a single colony of D. yakuba, which had been introduced from elsewhere, with no subsequent colonization events
D) descended from an original colony of D. yakuba, of which there are no surviving members. The current island D. yakuba represent a second colonization event from elsewhere.
Answer: D
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