Read the passage from "Barack Obama's First Inaugural Address."

"Our nation is at war against a far-reaching network of violence and hatred. Our economy is badly weakened, a consequence of greed and irresponsibility on the part of some, but also our collective failure to make hard choices and prepare the nation for a new age. Homes have been lost, jobs shed, businesses shuttered. Our health care is too costly, our schools fail too many—and each day brings further evidence that the ways we use energy strengthen our adversaries and threaten our planet."

Which rhetorical technique does Obama use in the passage to highlight that Americans need to unite so that they can improve the country?

A. Describing that America is coming to "a new age"
B. Repeating the word "Our" throughout the passage
C. Identifying many hardships that require solutions
D. Explaining that America has failed its people