I extracted blood from a patient
Singular possessive Answer: Robin's
D. The poem takes a nuetral stand on war
Well considering it is “sandwiched” between two pieces of bread I would say yes. Although it is weird to think about
It's B: After the rain ended, the sky became blue.
You can tell because a dependent clause cannot stand by itself to be a sentence. "After the rain ended" cannot be a sentence by itself.
All of the others can.
Hopefully this helps, if not i'd be happy to explain it more.
All the best,
17cruzc