Option B is the most likely to result in the increased prevalence of spots in a population of leopards. This is because natural selection favors traits that provide a survival advantage. In the case of leopards, having spots helps them blend in with their environment and become better hunters, which increases their chances of survival and reproduction. Over time, this can lead to the spotted trait becoming more common in the population, as individuals with the trait are more successful at passing it on to their offspring.