Hi again!
The excerpt's mood during the story is B, disbelief. The reason that this is disbelief is because the main character, after hearing what had happened, is shocked because of the news and basically stands still.
It's not A because the main character is not expecting the news to happen, and it's not C because the main character shows no joy after finding out what had happened. Lastly, it's not fear because the main character portrays no signs of fear, only shock.
Hope I helped :)