D. Runs and Jumps
Since you would say “Myra runs” or “Myra jumps”, you would make them plural.
It is a simple sentence.
A simple sentence contains one independent clause - which is the case with sentence 7. There is one subject (they) and one verb (rule), which means that it is a simple sentence (because of one verb only). A dependent clause wouldn't be able to stand on its own, and sentence 7 obviously can, which is why it is not dependent.
I embody and empower the rich. I fuel all humans in some way whether they admit or not. I am eternal and nobody can ever get rid of my power no matter how hard they try. What am I?
Answer to riddle: greed