The correct answer is C. The United States suffered an economic downturn starting in 2009.
Step-by-step explanation:
The graph shows the percentage of unemployment in the U.S. from 2006 to 2012. In this, you can see the unemployment rate was between 4% and 5% during 2006, 2007 and 2008; however, after this year the rate suddenly increased. Indeed in 2009, the rate was 6% and in 2010 it was 10%, which is evidently higher than in previous years. This situation suggests there was an economic recession or downturn that began in 2009 and continued during the following years, this explains why the number of unemployed people increased as an economical recession usually leads to fewer jobs. Thus, the most accurate statement is "The United States suffered an economic downturn starting in 2009".