Answer:
Option B) Carla has brown eye
Explanation:
Sex-linked characters such as colour vision are determined by a gene located on the X-chromosome.
The recessive allele for brown-eyed colour was masked in Carla's mother (that is why she had blue-eyed colour), but expressed in Carla's father (reason for his brown-eyed colour)
Thus, Carla's brown-eye colour means she possess a homozygous allelic pair for the sex-linked character, since her both parents contributed X-chromosome each.
