Answer:
A.
He forced the surrender of Japan without a ground invasion.
In general, no, the convoy system was not a successful strategy because the Germans generally were not afraid to sink the convoys either. But there were instances in which the convoys would engage with a Germany boat and win.
B) Appeal.
Hope this helps~!
~{Isle of flightless birds}
This is probably biological warfare because it's not allowed according to the Geneva congress. Using poisons, toxic matters, viruses and bacteria, as well as flamethrowers and things like that are forbidden or else it will be considered a war crime and people will answer for it. It was practiced in World War 1 but was forbidden after.