Answer:
D.
Step-by-step explanation:
the first answer A, hunting as a pack ensures that the wolves are not competing for food, is not affect the reproduction of wolves. answer B, grouping together prevents overpopulation is not a positive affect of reproduction. Answer C, living in groups prevent genetic variations from developing in offspring is not a behavior, but a genetic code. Cooperation supports producing more pups that survive to adulthood, positively affects wolves reproduction.