Step 1: Identify China's official currency.
China’s official currency is called the Renminbi (RMB).
Step 2: Understanding units.
The basic unit of the Renminbi is the Yuan, which is commonly used in global transactions.
Step 3: Eliminate other options.
Yen – Japan’s currency
Won – South Korea’s currency
Renminbi – is the official name, but "Yuan" is the correct unit answer.