Answer:
All of the choices are correct
Explanation:
Darwin observed that members of a population produced more offsprings which competed for depleting resources among themselves. Genetic varieties among organisms caused some organisms to be better adapted to survive as compared to other organisms in a population. These organisms were favoured by natural selection and they were able to reproduce and pass on their characteristics to their offsprings. The organisms with better characteristics has more reproductive success as compared to other organisms of the species.