THE ANSWER IS
B. The characteristic (blue eyes) is carried in a recessive gene.
your answer is (C): recessive gene
~Hope this helps~
Here would be the alleles:
BB-Homozygous Dominant for brown eyes
Bb-Heterozygous for brown eyes
bb-Homozygous Recessive for blue eyes
If you input the heterozygous allele for brown eyes into a punnet square, you would get a 25% chance of homozygous brown eyes, 50% chance of heterozygous brown eyes and a 25% chance of homozygous recessive blue eyes. Tim is that 25% that received a trait for blue eyes.
the answer could be that both parents are carrying the heterozygous genes. so let's say B is the dominant brown eye gene and b is the recessive blue eye gene. both parents could possess the Bb genotype, and hence by using test cross, Tim was that 25% chance where a child could inherit the bb genotype to have blue eyes