An example of selective breeding would be a
breeding a rabbit with another rabbit to increase the population
b
an orange house cat breeding with a feral cat in the wild
c
using wild horse DNA to create a transgenic race winning horse
d
breeding a cow with a bull who produces large muscular baby bulls

D

Explanation:

Selective breeding is when you a breeding 2 organisms in order to make a specific trait be passed down to the offspring.  Since you the offspring in this scenario have larger muscles, this is selective breding because you are "choosing" a trait.  A and B don't mention specific traits, and  C is wrong because you can't garuntee that the offspring will win a race.  D is the most logical choice

the answer is g1