Correct Answer: catalyst

Solution : The correct choice is the second option.

A catalyst is something that speeds up a reaction or process. In this context, it implies that the event acts as a trigger or something that propels individuals into becoming aware of the phenomenon.

The meanings of the other options are as follows:

• Dogma refers to a set of principles or beliefs that are accepted without evidence or argument.
• An elegy is a poem or piece of writing that mourns the loss of someone or something.
• Harangue means a lengthy and aggressive speech.