Which among the following statements is a part of Darwin's theory of evolution on the basis of natural selection?

The correct option is C There is high chance of survival if more offspring are produced
The mechanism that Darwin proposed along with Wallace for evolution is Natural selection. Organisms with heritable traits that favour survival and reproduction will tend to leave more offspring. Nature selects the fittest, fitness is the ability to adapt and procreate more.

Due to the limited resources, there is a struggle for existence among individuals, so often only a fraction of offspring survive to reproduce successfully; so more offspring production leads to high chance of survival of offspring with successful reproduction.

Natural selection is not specific or a predetermined mechanism of evolution, it is a random process. It is not selected on the basis of external factors, fitness is based on the characteristics which are inherited.