I'm not the greatest at grammar, but I think the very first one is incorrect. It should just be a comma, then the second just a comma as well, but the last one is correct. (I have no idea, I am sorry if you get it wrong.)
I believe the answer is character.
pretty sure they want the "If a patient is in pain, _they_ can use the call button to alert a nurse." which is bullcrap but, what can you do
Hello!
The verb in this sentence is "became" as it indicates the action of the subject (the defendant), which is what he/she did.
Hope this helps!