Answer:
I think it's B
Explanation:
You can eliminate C, because that wouldn't really show anything. You also know it isn't A, because attitudes can vary a lot day-to-day. D is the same way.
Answer:
John O'Sullivan, an editor of a well-known newspaper, wrote about our expansion and was credited with coining the term “manifest destiny”. Manifest Destiny was the idea that Americans believed it was their destiny to expand across North America all the way to the Pacific Ocean.
Explanation:
The best example for informal economic institution is tipping
This is an example of "self-fulfilling prophecy".
A self-fulfilling prophecy is a conviction that works out on the grounds that we are going about as though it is as of now obvious. Our desire that we will see a specific result changes our conduct, which shapes the way others see us. Thus, others give the criticism we've set ourselves up to get, which serves to fortify the first conviction.