Answer:
D
Explanation:
You can immediately eliminate B and C. So between A and D, D is the best answer.
Answer:
Two genes.
There are two change gatherings:
Changes 1,2,4, and 7 didn't supplement one another, and thus are on a similar quality.
Changes 3, 5 and 6 didn't supplement one another, however supplemented with transformations 1, 2, 4, and 7. Thus, these three transformations are available together on an alternate quality.