The Idea of a Hedonic Treadmill

The idea of a hedonic treadmill

A) predicts that emotional events (new car, house, marriage, etc.) have only short-term effects.
B) is drawn by analogy from sensory adaptation.
C) says we are stuck on a treadmill where we walk and walk, but never get anywhere in terms of increases in long-term happiness.
D) all of the above