Where two or more seams or sections are worked in a mine, the pillars in one seam or section shall be vertically above or below the pillars. The parting left between any two such seams or sections shall not be less than "A" meters in thickness at any place. A is given by

A. 0.5 m

B. 1 m

C. 2 m

D. 3 m

Answer: Option D