The time is included, but not the date. It is extremely important that on an invitation you include what date the event will be, just saying "It starts at 5:00pm", likely won't be enough to invite people.
It's not important to see a photo of Orson Wells. And who cares about the population of the United States. It has nothing to do with the topic. And same with a movie clip about aliens. So that leaves us with A. An audio clip of the actual radio broadcast.
