The repetition of 'how we ended world war one' emphasises the fact that they are probably proud of the actions they've done to end the war. They want to inform you that they did these specific things to prevent the war from going on. It's like a reminder to the reader that the people then did a lot.
I'd go with <span><em>B.To inform guests about the attractions available at Funland </em></span>
I’m about 90% sure it’s the top right— the two on the left simply aren’t true because it’s a reliable or ‘strong’ source, and the bottom right doesn’t give any indication that the source is good or bad. You should go with your gut, but that’s my guess.