Answer:
e. a and c only.
Explanation:
Publis speakers have an ethical obligation to be as honest and fair with the public and every member of society as possible, when a public speaker starts calling names a person or a group he is demeaning the dignity of the group or the person he is name calling, as well as undermining the right of that group or perosn to express their ideas, that is why a public speaker should avoid calling names, we have to remember to tolerate everything but intolerance.