7 grade science help no file they don’t work

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

One of the reasons that stars are so large is because

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.