What Does the Existential Perspective Suggest Is the Reason Why

What does the existential perspective suggest is the reason why people are quite sensitive to even small violations of expected meanings?

A) People prefer to seek out moments of uncertainty in the hope that they will discover new sources of meaning in life.
B) People experience negative arousal whenever their standard meanings are violated.
C) If the world is not an orderly place, people may be unable to maintain faith that any of their accomplishments will be remembered after they die.
D) The earliest humans who were sensitive to violated meanings were more likely to survive and reproduce than those who were insensitive to such violations.