Answer:
Option D,whether the mutation makes some wolves more fit for their environment than other wolves
Step-by-step explanation:
Mutation creating a new fur color in the wolf population will continue to persists in the ecosystem only when it makes the wolf population more fit to survive in the prevailing environmental conditions.
For instance , if the new fur color makes wolf appear as a violent species to its predators then as per the theory of natural selection more and more wolf will interbreed with colorful fur wolf species to produce offspring that are able to cope up with the environment and emerge as the fittest of all.
Hence, option D is correct