“This century was a time of serenity and security, the age of house parties and long
weekends in the country."

Explanation:

This question is not clear, I infer it is a quote by someone. An insight to where you can get help on who made the quote is by getting information on the subject matter.

However, commenting on the statement, I would say indeed this Century has been the age of house parties and long weekends in the country but NOT of serenity and security. Why? Because there has been more insecurity and serinity more than ever.

A. eye  is the answer.