The U. S. dollar:

A) is the world's leading reserve currency.
B) has been weakening against other currencies for most of the 2000s.
C) has diminished in stature due to the financial crisis of 2008.
D) All of these are correct.

Reserve Currency

A foreign currency held in significant quantities by governments and institutions as part of their foreign exchange reserves.

Financial Crisis

A situation in which the value of financial institutions or assets drops rapidly, leading to a loss of confidence in the financial system and, potentially, bank failures or economic downturns.

Weakening

A decline in strength, value, or effectiveness, often referring to currencies, economies, or company performance.