Context: This passage describes the antenna type trait in fruit flies:
Most fruit flies have a pair of antennae on their head. But, some flies appear to have an extra pair of legs on their head instead! These flies have a mutation, or change, in a gene that affects body development. This mutation makes the cells in the fly's head form mutated antennae that are like legs.
In a group of fruit flies, some individuals have mutated antennae and others have normal antennae. In this group, the gene for the antenna type trait has two alleles. The allele for mutated antennae (A) is dominant over the allele for normal antennae (a).
This Punnett square shows a cross between two fruit flies.
What is the probability that a fruit fly produced by this cross will be homozygous dominant for the antenna type gene?
A. 0/4
B. 1/4
C. 4/4
D. 2/4
E. 3/4
From the given choices, select the correct answer and reply with the letter of the chosen option.

B