In a group of rose plants, some individuals have thorns and others do not. In this group, the gene for the thorns trait has two alleles. The allele for not having thorns (n) is recessive to the allele for having thorns (R). A certain rose plant from this group has the heterozygous genotype Rr for the thorns gene. Based on this information, what is this plant's phenotype for the thorns trait?

A. Having thorns
B. No thorns