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 think that The answer is b.
No. It should be "Paloma did not make it to work, for her car broke down on the freeway".
Answer: test them and find out and if you’re wondering if you can trust someone to begin with, then you probably can’t