The first one makes more sense
Answer:
Genotype of female dragon allele - Hh
Genotype of male dragon allele - hh
When these two dragons mate, in their F1 generation or progeny you can find Hh, Hh, hh or hh. So the F1 generation has a 50% chance of either inheriting horns or not
Hope this helps!
The answer is B. A is impossible and C isn't relevant
D) a change in protein synthesis