The correct answer is option A, Overproduction.
Overproduction refers to a driving force in natural selection, as it can result in variations and adaptations in a species. Darwin argued that all species overproduce, as they have more offspring, which can, in reality, attain reproductive age, on the basis of the available resources.
Overproduction takes place when species reproduce various offsprings, which can probably survive. Those who survive then pass on their genes to their progeny.