Choice A has an incorrect comma after brown. It should be absent to sound correct. To hear the difference in your head think "brown paper bag" versus "brown....paper bag".
Choice B lacks a comma after sunscreen.
Choice C correctly places commas when saying "not Karmen". This seems to be the correct answer.
Choice D is incorrect, it fail to put a comma after "a star on the swim team".
Choice C is the correct choice.
Need to see the passage dust storm to answer
I believe it would be a soliloquy. A soliloquy is defined as a person speaking to themselves without any regard for someone that may hear it (or oblivious to them).
Who are they??? This isn't even a legit question