Which of the following is an example of a justiciable controversy that gives a person or persons a standing to sue? a. A lawsuit filed by a hospital against its official sewage cleaners as the latter failed to remove toxic garbage from the hospital's vicinity b. A lawsuit filed by a shop owner against an innocent customer because of previous personal grudges c. A lawsuit filed by a school district against a television channel for broadcasting violent advertisements d. A lawsuit filed by an environmental group against the U.S. government for the latter's purchase of oil e. A lawsuit filed by a not-for-profit organization against an entrepreneur for opening another not-for-profit organization