Context: This passage describes the growth pattern trait in rose plants:

In a group of rose plants, some individuals have climbing growth and others have bush growth. In this group, the gene for the growth pattern trait has two alleles. The allele for bush growth (g) is recessive to the allele for climbing growth (G).
A certain rose plant from this group has the homozygous genotype GG for the growth pattern gene.
Based on this information, what is this plant's phenotype for the growth pattern trait?
A. bush growth
B. climbing growth
Determine the correct option from the provided choices and reply with its corresponding letter.
Answer: B