A synopsis is a brief summary of a stories events-B.
Nothing is underlined in your sentence, but the sentence sounds like it is set in the present.
B. present
It depends what they are talking about.
If they are talking about the bombing of 9/11 then the tone would be serious, sad, mad at the other country for doing what they did.
But, if they are talking about a major- fun holiday- like Halloween then the tone would happy, excited, energetic! It just depends what the topic the author is talking about!!
Hoped this helped you! :))
