Duane teaches in an industrial city where residents are concerned about groundwater contamination. Duane is elected president of a citizens' environmental group that some residents consider controversial. Near the end of the school year, Duane's principal quietly tells him that he will not be offered a third-year teacher's contract because of his reputation as a "radical environmentalist." Which of this teacher's rights has been violated? Group of answer choices The right to substantive due process The everyday ethics of teaching The right to procedural due process The right to a teaching contract