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To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than____________________?

To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than____________________?

A. 2.4 m above the hydraulic gradient
B. 6.4 m above the hydraulic gradient
C. 10.0 m above the hydraulic gradient
D. 5.0 above the hydraulic gradient
E. none of the above