In the given diagram, the population of the black moths is increasing with each generation, and the population of the peppered moths is declining. This information can be inferred as the proof that the black moths are better adapted to their environment than the speckled moths. The natural selection process selects the more adapted species to continue, and hence, they live longer and their population increases, while the species that are not well-adapted decreases in their population.
Hence, the correct answer is 'option A - Black moths are adapted to their environment better than speckled moths.'
