From Mid-2008 Through Early 2009, the Dollar's Value Moderately Increased

From mid-2008 through early 2009, the dollar's value moderately increased against major currencies, despite the fact that the American economy was suffering from a serious financial crisis. What caused this phenomenon?

A) High real interest rates in the United States compared to any other developed region in the world sparked an inflow of funds into the country.
B) U.S. assets were characterized by a high-risk, high-return payoff which prompted foreign investors to park their funds.
C) Foreign investors were excited at the possibility of high returns following the government bail-out of financial institutions.
D) Foreign investors put their money in low-risk U.S. assets such as low-yielding U.S. government bonds.
E) Foreign investors saw opportunities in the United States as the level of indebtedness had begun declining.