I really wish you provided the research study. I would be happy to answer. It should be attached to wherever you found this question. Hope this helps :)
The correct answer is C) the fact that people sometimes base perceptions of quality on price (snob effect).
A well-known women's college whose tuition lagged below similar schools found recruiting difficult and enrollment falling. A substantial tuition increase was implemented, and dormitories were soon full again. This can be explained by the fact that people sometimes base perceptions of quality on price (snob effect).
In microeconomics, in the snob effect, the demand for some goods that are considered expensive are more demanded. If people that have the money to spend of something assumes that the price of the product is cheap, these people think that the product has low quality. But if the same product is expensive, they consider that the product has quality and is well worth it. That is why, in the case of the college, when the price of tuition increased, people started to trust again in the school and the dorms were full.
There was both guerilla warfare and trench warfare in this global war
Because the USA and other countries fear nuclear threats and are afraid they will bomb their country. This would result in war and use of more nuclear weapons which would kill many.
Well what decade do you want to focus on? And what country/place are the immigrants going to? Are we talking immigration into the US for a single decade? Including slavery ? Would the people forced into the country still be considered immigrants