Whose two or more seams or sections are worked in a mine, the pillars in one seam or section shall as far as practicable be vertically above or below the pillars in the same or other seam or section unless the strate are inclined at an angle of more than . . . . . . . . degree from the horizontal.

A. 30

B. 45

C. 60

D. 90

Answer: Option A