Geology please help?

Assuming a constant rate of movement for the past 30 million years, what is the approximate rate of offset?
 a. 37 km/Myr = 370 mm/yr
 b. 10 km/Myr = 10 mm/yr
 c. 10 km/Myr = 100 mm/yr
 d. 37 km/Myr = 37 mm/yr

2017-04-11T00:37:33.809Z

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