The unemployment rate is the percentage of the economically active population that is unemployed in a given period of time. This rate is associated with the economic moment of the country, if the economy is heated, the unemployment rate is usually low. If the economy is in recession, stagnant or with low growth, the unemployment rate usually increases.
In the case of the USA, between 2001 and 2007 the unemployment rate fluctuated slightly and around 5%. However, from 2007 onwards the unemployment rate went up slightly, from less than 4.6% to 9%, that is to say practically doubled.This can be explained in part by the crisis that the world experienced in 2008, which began in the USA.
Graphic attached!
Therefore, the third answer is correct (C).