If a foreign currency relative to the u. s. dollar, americans must pay more for goods and services bought from sellers in the country that issues the currency. goes upgoes downvariesis unstable

The correct answer is "goes up".

Explanation: If a foreign currency GOES UP relative to the U.S. dollar, Americans must pay more for goods and services bought from sellers in the country that issues the currency.

This happens because the value of the currency of the foreign country increases in relation to the US dollar, therefore the goods and services of that foreign country will cost more for the Americans.