One can hear a speech but not listen to it

The type of speech most audiences and speakers prefer, which is conversational but

researched, organized, and practiced, is _________. Fill in the blanks with correct word

Raiha is speaking to her class about ethical behavior and includes a definition by Aristotle, a Greek philosopher who helped develop the term "ethics." This is an example of _________.

A. defining by etymology B. defining by authority C. defining by negation D. defining by operations