In Research on Response Modulation and Psychopathy,psychopaths Won or Lost

In research on response modulation and psychopathy,psychopaths won or lost money depending on what playing cards appeared.In this research,the impulsivity of psychopaths was studied by

A) making them wait before deciding to continue the game.
B) having them estimate the amount of money they had won.
C) ratings of their verbal statements during the game.
D) All of the above are correct