Between what time earth hour was celebrated in Pakistan on 24th March 2018?

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Between what time earth hour was celebrated in Pakistan on 24th March 2018?

A. 7:30 PM – 8:30 PM
B. 6:30 PM – 7:30 PM
C. 8:30 PM – 9:30 PM
D. 9:30 PM – 10:30 PM