State the day, on which we celebrate World Metrology Day every year?

A. 5/18/2017 12:00:00 AM

B. 5/19/2017 12:00:00 AM

C. 5/20/2017 12:00:00 AM

D. 5/21/2017 12:00:00 AM

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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