***ECONOMICS***
I’ll give a brainliest !

Economists calculate the trade-weighted value of the U.S. dollar by:
O A. examining the confidence global investors have in the dollar as a
reserve currency.
B. analyzing the decline in the dollar's purchasing power over time
due to inflation.
c. comparing the value of the dollar to currencies used by major U.S.
trading partners.
D. subtracting the market value of the U.S. dollar from the market
value of gold.