The correct answer is B. Darwin.
The Law of Natural Selection is a theory that Charles Darwin developed to explain how species evolve over time. The theory states that organisms that are better adapted to their environment are more likely to survive and reproduce, passing on their genes to the next generation. This process, over time, can lead to the evolution of new species.
Dalton was a chemist who developed the atomic theory of matter. Kepler was an astronomer who developed the laws of planetary motion. Mendel was a monk who studied genetics and developed the laws of inheritance.
While all of these scientists made important contributions to science, only Darwin developed the theory of natural selection.