Which of the following is a type of subsurface mining? 

A)  strip mining 
B)  room-and-pillar mining 
C)  contour mining 
D)  mountaintop removal

Subsurface Mining

A method of extracting minerals and ores from beneath the earth's surface, involving tunnels or shafts, as opposed to open-pit or surface mining.

Room-And-Pillar

A method of mining that involves excavating rooms while leaving columns or pillars of material to support the mine roof.