Does the following statement describe actions taken in self$-$interest or actions that serve the social interest or both?

Philip Knight, the owner of Nike is worth billions of dollars. Nike pays its workers in Asia $20$ cents an hour to produce a pair of sneakers which sells for $$100.$

A$.$ Philip Knight's action is taken in self$-$interest but not in the social interest.

B$.$ Philip Knight's action is neither serving the social interest nor taken in self$-$interest.

C$.$ Philip Knight's action is taken in both self$-$interest and in the social interest.

D$.$ Philip Knight is serving the social interest but not self$-$interest.