Which one of the following is most analogous to the "professional solidarity" referred to? A. Members of a teachers' union go on strike when they believe one of their colleagues to be falsely accused of using an inappropriate textbook. B. In order to protect the reputation of the press in the face of a largely hostile public, a journalist conceals distortions in a colleague's news article. C. Several dozen recording artists agree to participate in a concert to benefit an endangered environmental habitat. D. In order to expedite governmental approval of a drug, a government official is persuaded to look the other way when a pharmaceutical manufacturer conceals evidence that the drug may have minor side effects. E. A popular politician agrees to campaign for another, less popular politician belonging to the same political party.