Measuring well-being is difficult for utilitarians because there A. is no precise unit of happiness. B. might be multiple things that directly contribute to well-being. C. doesn't seem to be any method to compare the quantities of different benefits. D. all of the above
There is no precise unit of happiness, there might be multiple things that directly contribute to well-being, there doesn't seem to be any method to compare the quantities of different benefits (All of the above.)