Definition of artficial and natural radioactivity

The key difference between natural and artificial radioactivity is that natural radioactivity takes place on its own in nature whereas when it is induced by man in laboratories, it is called artificial radioactivity.

Explanation:

B. I am king.

Ethos is a mode of persuading people, through writing or speech, by appealing to ethics via the authority or credibility that the persuader has in a certain society. The "I am king" sentence is an example of that because the speaker mentions his most notable characteristic maybe to convince someone on something: "I am king, therefore you will never be in fear of me making decisions that will do harm to you, my people"