Answer:
use truthful, accurate supporting materials
Step-by-step explanation:
A speaker discusses the Department of Agriculture's 1946 model of four basic food groups without mentioning the five-group model adopted in 1992 or the introduction of MyPlate in 2010. This speaker has violated the ethical responsibility to use truthful, accurate supporting materials .
In giving a speech or lecture, it is necessary to use truthful and accurate supporting material that addresses the issues you are discussing, this makes the presentation more factual and reach in information. Since the speaker was talking on the four basic food groups, it would be wise for the speaker to mention or make reference to the prevailing body of information that addresses the subject of discuss such as other food group models in literature.