Answer:
The answer is D.
Step-by-step explanation:
Options A, C and E can not be the correct answer because they are not introducing a new population or a new habitat to the equation, the mating is done among the same species and the same habitat in all of these options which can not lead to rapid evolutionary change at all.
The answer is D because the two populations are inhibiting different environments and habitats and over a period of time, they have developed different traits and there is difference between their genomes, which when there is interbreeding, will result in a rapid change in physiological traits.
I hope this answer helps.