Context: In a group of muskmelon plants, some individuals have sour fruit and others have sweet fruit. In this group, the gene for the fruit taste trait has two alleles. The allele F is for sour fruit, and the allele f is for sweet fruit.
A certain muskmelon plant from this group has sour fruit. This plant has one allele for sour fruit and one allele for sweet fruit.
Based on this information, what is this muskmelon plant's genotype for the fruit taste gene?
A. sour fruit
B. Ff
Select the correct answer from the given choices and respond with the letter of the chosen option.

B