Which of the following is a necessary component of allopatric speciation?

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Allopatric speciation occurs when a physical or geographic barrier separates a population, preventing gene flow between them. Without this barrier, the populations may continue to interbreed and remain the same species. Hybridization (A) may occur in some cases but is not necessary for allopatric speciation. Polyploidy (B) may be a mechanism for sympatric speciation but is not necessary for allopatric speciation. Key innovations (D) may also lead to speciation but are not a necessary component of allopatric speciation.

Which of the Following Is a Necessary Component of Allopatric