Answer:
There has been the introduction of online libraries and e-books
Explanation:
Over the last 20 years, technology has changed a lot. The introduction of the phone lead to online libraries and e-books. Also the rate of obesity ghastly increased since the introduction of fast food restaurants and fashion has been a big industry for many years.
I would be (D) because we would like to be a society that has good manners and so we don't segregate.
hope this helps.
I'm going to infer you are talking about Irony. It would be situational irony.
Answer: Keep it where it is
Explanation: Where it is is the grammatically correct answer and that is where people use it.