The only option that is not generally a reason why historians study societal change would be "<span>d. to estimate how long it would take to build a road system," since this requires a separate type of research. </span>
The exchange rates of a currency are responsible for the purpose of comparison of currencies of two different countries.
<h3>What is currency exchange?</h3>
The rate at which the one currency is exchanged at with another currency(s) is known as the rate of currency exchange. These currencies generally vary with a change in their countries.
Hence, option C holds true regarding the currency exchange.
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Answer: B.
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