Answer:
C). While fear can be useful in protecting us against danger, anxiety is not always helpful.
Explanation:
In the given excerpt, the third option i.e. 'while fear...helpful' most aptly conveys the key idea of the segment 'Why We Worry' as it shows how fear can be beneficial in defending dangers ahead and preserve us while anxiety may lead us in danger. Thus, the central idea that the author is conveying is that one can be fearful as it shows something is happening while one should not worry about anything as it signals of something actually not happening. Thus, <u>option C</u> is the correct answer.
I guess formal and informal refer to two types of essay - you can write a formal essay where you avoid conversational language and such and where you need to be very professional, or you can write informally where you don't have to think about such things, it is very casual.
There is a television crew coming to do a story on it. this is the answer
