Which line in "From Barter to Bitcoin" best supports the idea that people often adopt forms of currency that are more convenient or easy to use?
"Wampum served as a currency in North America for many years. "
"The original currency was probably a measure of grain, such as a bushel of wheat or barley. "
"The ancient Chinese produced some of the world’s first coins. "
"A debit card allows account holders to use their money without writing a check. "
