The reduced levels of points, 30 metres apart along the longitudinal section of a road portion between chainages 5 and 9 are shown in the given figure. If there is a uniform up-gradient of the road 120 in 1, the chainage of the point with no filling or cutting is__________________?

A. None of these

B. (6 + 18) chains

C. (6 + 12) chains

D. (6 + 15) chains

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