"Bigfoot. Sasquatch. Yeti. Yeren. Yowie. The names and details may differ from place to place, but from North America to China to New Zealand, one thing is certain: Something is out there." How do these lines help to develop a key concept of the article? A. It illustrates that people all over the world have believed Bigfoot exists. B. It emphasizes that many different creatures have been confused with Bigfoot. C. It shows that Bigfoot has traveled all over the world. D. It confirms that Bigfoot has remained unidentified.

A. It illustrates that people all over the world have believed Bigfoot exists.

Explanation:

In the article "A Bigfoot by Any Other Name" from the book Tales of the Cryptids: Mysterious Creatures That May or May Not Exist, the writers, Kelly Miner Halls, Rick Spears, and Roxyanne Young mentioned about the different names of the Bigfoot in different parts of the world. From the American continent to the Asian countries, this elusive creature seems to exist, but just not discovered yet.

The different names don’t mean that they are different creatures. And with it, it also makes it certain that everyone from East to West believes in the presence and existence of "something [that] is out there".

Thus, the key concept of the article is that people all over the world have believed in the existence of Bigfoot, which is further illustrated by the different names given by different countries.  

Thus, the correct answer is option A.

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