In the following passage some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.
The quest for a _____ life engrosses every human being on this earth. Everyman tends to define a happy life in a _____ individualistic fashion. _____have attempted to define a happy life in various terms. Hedonists have a _____ notion that happiness lies in the _____ of physical appetites.
that happiness lies in the _____ of physical appetites
1). gratification
2). simplification
3). purification
4). identification