Ans.
Overproduction can be defined a condition, when organisms of a species reproduce many more progeny that can possibly survive in a particular region. It represents a driving force in natural selection, since it may result in variations and adaptations in a population.
A benefit of overproduction is that it improves the chances of survival of the species as it leads to increase in genetic variation of that specie.
Thus, the correct answer is option). 'the increase in genetic variation of a population.'