Answer:
B. Irrational Forces
Explanation:
Irrational Forces -
It refers to some unnatural or unforeseen condition , which may hamper the brains of the people , is referred to as irrational forces.
They are basically some uninvited conditions.
For example , any argument or any activity may result the person unhappy , annoyed or angry.
Similarly , from the question,
The tragic event , left the people very astonished and scared , is an example of the irrational forces.