Which of the following occurs most often in a population when genetic variation and overproduction are present? some organisms have a lower reproductive success than others. some organisms have a higher reproductive success than others. some organisms have no reproductive success. some organisms do not have genetic variation.

Option B, Some organisms have a higher reproductive success than others.

Explanation:

Over production is a scenario where an individual produce more than the normal offspring which enhances the survival rate of the newly born species.  

Genetic variation causes genetic evolution which lead to development of individuals that are able enough to cope up with the existing environmental condition.  

Both over production and genetic variation are leading to  higher rate of survival of a newly borne individual and hence causes higher reproductive success.

Option B is correct

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any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.