The "Panic Begins" for Many Middle-Aged Americans Regarding the Thought

Multiple Choice

The "panic begins" for many middle-aged Americans regarding the thought of death.Which is the correct reason for this?

A) Realization that the remaining years of life are fewer than those already lived
B) Realization that after one's parents are dead,the "buffer zone" is gone
C) If one's job depends on physical vigor,the realization that physical strength is beginning to wane
D) All of the above
E) Only a and b