Answer:
Ad hominem
Explanation:
The question says that celebrities "are not experts," which is a testification against their qualification even though that's irrelevant because you don't have to be an <em>expert </em>on the environment to speak on it.
Answer:
Communication is an essential process in social life, through which individuals express themselves, integrate and exchange knowledge. Since there are several ways to establish communication and several channels for it to occur, it is necessary that the communication process is aligned with the environment and individuals.
In the workplace, for example, communication is essential to create an organizational culture favorable to team development, to motivate, to share knowledge, to integrate, etc. An effective leader is one who uses open and assertive communication so that his message is transmitted in the best possible way to his subordinates, so that determined organizational goals and targets are achieved.