Answer:
a. Mass hysteria
Explanation:
Mass hysteria In sociology and psychology, is a phenomenon that transmits collective illusions of threats, whether real or imaginary, through a population in society due to what they heard (rumors) and/or fear.
In medicine, mass hysteria can be said to be the spontaneous manifestation or production of chemicals in the body that makes you have the same or similar hysterical physical symptoms by a two or more people.
That is to say, you begin to feel as though you re sick or that you have a physical injury that the other person has, when In reality you do not have these things.
An Example of mass hysteria occurs when a group of people believe they are suffering from a similar disease or ailment, it is also called mass psychogenic illness or epidemic hysteria.
This is what happened when the audience(from the question) learnt that Martians has landed in new Jersey.