The sequence of events in geographic speciation is most likely to be

  • A

    Genetic divergence $\rightarrow$ geographic barrier $\rightarrow$ reproductive isolation

  • B

    Geographic barrier $\rightarrow$ genetic divergence $\rightarrow$ reproductive isolation

  • C

    Reproductive isolation $\rightarrow$ genetic divergence $\rightarrow$ geographic barrier

  • D

    geographic barrier $\rightarrow$ reproductive isolation $\rightarrow$ Genetic divergence

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