An underground panel extracted in a coal mine has a strike length of 500 m. After subsidence survey, it was found that the length of a straight line between the extreme limits of the subsided area on surface is 593.2 m along the strike direction. The depth of the extracted panel from the surface is 100 m. The angle of draw for the overlying strata assuming identical subsidence on either side of the centre of the panel is

A. 18°

B. 25°

C. 35°

D. 28°

Answer: Option B