Which of the Following Is an Example of Self-Interest That

Which of the following is an example of self-interest that attempts to promote the public interest?

A) A mother prevents her children from becoming vaccinated against measles, mumps, and rubella because of fears of autism.
B) The President of the United States restricts American consumers from buying foreign-made products.
C) The New York Yankees beat the Boston Red Sox.
D) An entrepreneur risks his life savings to open up a grocery store in an underserved area.