D. European currency
Most of the EU (European Union) use the euro but 9 countries: Bulgaria<span>, Croatia, </span>Czech Republic, Denmark,Hungary<span>, </span>Poland<span>, </span>Romania<span>, Sweden, and the </span>United Kingdom use their own currency.
Most countries however do use the euro after joining the EU, like France dropped using the franc and started using the euro.
Explanation:
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Technological innovations throughout history?