. Please help with this question I can’t get anymore wrong

The aforementioned excerpt on exchange rate would most likely be found in this source: D. a business dictionary.
An exchange rate can be defined as a measure of the rate at which a particular country's currency will be traded for another country's currency, especially for the purpose of buying and selling of goods and services.
Generally, some of the factors that affect the exchange rate of a country include the following:
In this context, we can infer and logically deduce that the aforementioned excerpt on exchange rate would most likely be found in a business dictionary.
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