Hello,
The answer is option B "Bb".
Reason:
A recessive genotype has one lower case and one upper case letter (option B) A recessive homogeneous is two lower case letters (option A) XY is not a genotype. and dominate is two upper case letters (option C) therefore the answer is option B.
If you need anymore help feel free to ask me!
Hope this helps!
~Nonportrit