Churchill’s speech was meant to inspire the British people to continue fighting in the war, and to protect and fight for the survival of their empire and everything they stood for, and to do this as a united nation against their opponent.
"Tragic," may work, depending if the questions is multiple choice or not.
Your picture is blank and won’t let me click on it..
C the narrator traveled with the artillery man
We can't see underlining here, but here, I think this will be helpful:
"I read a novel" would be the intependent clause: it does not need the other one to be complete.
"until the guests arrived" is the subordinate clause: it needs the independent, main clause to be complete.