The city to which you are referring should be Incheon, otherwise named Incheon Metropolitan City.
The answer is will be B because this was after planning and debating.
By finding out they did bad
Agricultural intensification increases biodiversity.
They should interview other people who fought in that same war ( which would be back up witness for these two different accounts). So whoever has the most back up witnesses must be telling the truth ( also make sure the other people you interview don't know they are back up witness).