2019 speciation paper

Hi, I’m a bit confused on the 2nd bullet point question on the 2019 speciation paper. It asks for how genetic drift can play a role in speciation. And usually you have to relate the question to the context. But reading through the question, I cannot seem to find any context on genetic drift in the question. So I’m not quite sure how to answer this question & if I have to, how do I link it to the context of the question.
Thanks so much in advance.