Which ethical responsibility requires speakers to choose to create messages that they firmly believe are in the best interests of the audience rather than choose messages that are self-serving or crafted in a way that manipulates the audience

Ethical Speaking is a branch in Ethics which urges public speakers to engages incredible and honest speeches. It is commonly applied in politics, where candidates normally lead numerous public speeches throughout the campaign and subsequently, while in office.

Ethical Speaking requires the transmitter of the message to be honest and avoid plagiarism, or the practice of taking passages of others rhetoric or ideas into one's own speech. Political candidates normally feel tempted to say what the people "want to hear". However, this leads to negative consequences in the middle term, as they are unable to comply with the proposals they made during their speeches once they are in office.

answer; the population in brazil is very diverse there are many races and ethnic groups

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.