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Answer :
"An advantage of subsurface (underground) coal mining is that it employs more people than surface mining techniques and thus creates more jobs." So, the correct option is A.
Subsurface mining techniques are used when material ores are too deep to reach using surface mining techniques. Subsurface mining has the benefit of causing much less ground disturbance than surface mining. In actuality, it disturbs less ground than a tenth of what surface mining does.
When the ore body is too deep to be mined effectively by open pit, subsurface mining has advantages. The orebody's grades or quality are high enough to pay expenses. Compared to open pit mining, underground mining has a smaller environmental impact.
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