A supporting paragraph! Hope I helped :)
I believe that the answer is; D. Move the comma and place it after softly.
The sentence would look like this:
Geoffrey mumbled softly, "She could have fixed it. I know she could have."
As soon as you're in the sky, that's outer space.
However, the atmosphere is only 40 or so miles thick.
Answer:
YOU
Explanation:
YOU-he-they-she that's second person