question_answer

If X represents combustible substances and Y represents non-combustible substances then which one of the following options is correct?

A) X: petrol, cement, coal; Y: charcoal, stone, iron

B) X: wood, paper, CNG; Y: sand, water, cement

C) X: paper, cloth, wood, Y: coal, water, soil

D) X: leaves, cow-dung, coal; Y: alcohol, iron, cement

E) None of these