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As of the ...., multiple unit systems are used all over the world such as the United States Customary System, the British Customary System, and the International System.
- A 21st century
- B 20th century
- C 14th century
- D 15th century
That's Correct!
It's Wrong!
In the 21st century, multiple unit systems are used all over the world such as the United States Customary System, the British Customary System, and the International System. This implies that prior to the 21st century, these unit systems may not have been widely used or recognized globally.
