I think it is C, because if I'm right present principal is something that is happening presently? If so, C would be the answer because they "are doing" the exercises right now in context.
problem that propels a story forward
C
Answer:
I believe it's the sentence that says "Fear inched up her spine as she opened the door to the dark, dank and dusty room."
Answer:
It was the first spacewalk with all women astronauts.
Explanation:
I hope you were looking for the answer about the 2019 NASA space launch. Hope this helps :)