Which of the Following Statements About the So-Called "Hedonic Treadmill

Which of the following statements about the so-called "hedonic treadmill" is not true?

A) It is a consequence of the fact that our brains are wired to notice changes rather than states.
B) An increase in consumption level will give a permanent increase in happiness.
C) It is the reason why people across a wide spectrum of incomes are found to be equally happy.
D) A one-shot increase in income will, in the long run, not affect people's sense of satisfaction.