The credibility of the media is a crucial aspect in maintaining the trust of the public. It is important for the media to adhere to certain ethical standards in order to retain their credibility. In the given options, all except option 'C' contribute to maintaining the credibility of the media. Let's analyze each option to understand why 'C' is the correct answer.

a) Media should not pronounce people guilty or innocence:
When reporting on legal matters, it is essential for the media to present the facts objectively without passing judgments on the guilt or innocence of individuals involved in a case. Media should strive to present accurate information and allow the legal system to determine the guilt or innocence of individuals through a fair trial.

b) Media should not conduct trials:
The role of the media is to report on trials and legal proceedings, not to conduct them. Conducting trials is the responsibility of the legal system, and the media should focus on providing accurate coverage of the events taking place in the courtroom. By leaving the trial process to the appropriate authorities, the media can maintain its credibility.

c) Media resort to unethical means:
This option is the correct answer because resorting to unethical means, such as fabrication of stories, misrepresentation of facts, invasion of privacy, or biased reporting, undermines the credibility of the media. It is essential for the media to adhere to ethical standards and strive for accuracy, fairness, and objectivity in their reporting.

d) It does not make money from sting operations:
While it is important for the media to generate revenue to sustain their operations, making money from sting operations is not directly related to the credibility of the media. Sting operations, when conducted ethically and in the public interest, can expose corruption or wrongdoing. However, the media should ensure that such operations are conducted within legal and ethical boundaries to maintain their credibility.

In conclusion, option 'C' is the correct answer because the media should not resort to unethical means, such as fabrication, misrepresentation, invasion of privacy, or biased reporting, as it undermines their credibility. Adhering to ethical standards and maintaining objectivity in their reporting is crucial for the media to retain the trust of the public.