The correct answer is (b)Species B will have a wider range of leaf colors.
The Species A will show only three different phenotype but the species B will show many more combinations as compared to species A. The more the number of alleles more will be the possibilities of combinations. The greater number of combination indicates wider range of leaf colors. For example, the height in human being is a polygenic trait which means more than two allele is responsible for this feature. The height of individuals can be any number. So, the species having more than two alleles will have a wider range of characters.