Sorry no clue this is more of a science question.
The detail that is essential to Churchill’s argument that countries should not remain neutral in the war is: A. “French and British Armies might well at the outset have saved not only Belgium but perhaps even Poland” since Churchill stated that the French and British saved Belgium during WW2 after it was attacked.
I’m assuming fact and opinion because many people have different opinions when it comes to presidents , plus if they both are ranked , it could be a well known fact as well . so i’d say fact and opinion. if i’m wrong i apologize .. but i hope this helped. <3