Which Situation Is Least Likely to Lead to Geographic Isolation

Which situation is least likely to lead to geographic isolation and allopatric speciation?

A) An eight-lane highway dividing a population of snails with limited mobility
B) A deep, narrow river dividing a population of hummingbirds
C) A deep, narrow river dividing a population of white-footed mice (not known for their swimming ability)
D) A patch of land bisecting a river and divides a population of minnows
E) A mountain range divideing a population of moths

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