Question

Which of these sentences is true about genetic variation?

A. mutations always carry out beneficial genetic variations in an organism
B. mutations always carry out harmful genetic variations in an organism
C. mutations are one of the key factors in genetic variations

Answer 1

The question is asking to choose among the following choices that states the truth about genetic variation and base on my further research, I would say that the answer among the following is in letter C. mutation are one of the key factors in genetic variations. I hope you are satisfied with my answer and feel free to ask for more 

Answer 2

The answer is not A because mutations can carry out bad genetic variations.
The answer is not B because mutations can carry out good genetic variations.

So, the answer is C because mutation is one of the key factors of genetic variation. (mutations can also have no affect)