How did the Tea Party movement in Congress drive the country to the brink of crisis in the summer of 2011?

A.
Tea Party members blocked the halls of Congress with sit-down protests.

B.
Tea Party members refused to raise the federal debt ceiling until the last minute.

C.
Tea Party members sabotaged the Social Security check-mailing system deliberately.

D.
Tea Party members pushed for the impeachment of Barack Obama, arguing he was not born in the United States.

B. Tea Party members refused to raise the federal debt ceiling until the last minute. In the summer of 2011, Tea Party members in Congress, particularly in the House of Representatives, made a stand against raising the federal debt ceiling unless significant budget cuts were made. This caused a political deadlock and pushed the country to the brink of a financial crisis, as the government risked defaulting on its debt obligations. It was only resolved at the last minute with a compromise agreement that included some budget cuts but also raised the debt ceiling.