The answer is b. regardless.
The most probable answer to this problem would be C. A global mass extinction.
The Mesozoic Era or what they commonly refer to as the age of the dinosaurs, is yet to be established as to what really did cause the extinction of life during this era. The popular belief and what is shared to the public to be remembered is that it was caused by an asteroid impact. The dust and ashes that it produced blocked the sky for days which caused the continuous death of organisms. In other sources, it can be said that massive volcanic eruptions occurred and filled the atmosphere with carbon dioxide. With the help of microbes eating carbon dioxide, they superheated the planet because in the process, these microbes eat carbon dioxide and release methane. Another one would be massive and continuous volcanic release of lava. It wasn't exactly determined if either one or maybe all of them occurred at once to wipe out life on that era.
Presenting your speech in front of a mirror would be the best way to rehearse and evaluate your nonverbal behavior. This is because you can view your own actions and expressions yourself and determine what you do and do not like and what needs improvement. It would then be beneficial to present to family and friends afterwards to have them evaluate you after you view yourself. The other options focus strictly on your verbal behavior and you cannot self evaluate through those rehearsal methods.
