ONE MINUTE TO SOLVE THIS, WILL MARK BRAINLIEST, PLZ HURRY How is velocity different from speed? Gives a direction No direction given​

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.