Hence A Option is Correct.
- peat - a brown material consisting of partly decomposed vegetable matter forming a deposit on acidic, boggy, ground, which is dried for use in gardening and as fuel.
- embers - a small piece of burning or glowing coal or wood in a dying fire.
- coke - a solid fuel made by heating coal in the absence of air so that the volatile components are driven off.
- coal - a combustible black or dark brown rock consisting chiefly of carbonized plant matter, found mainly in underground seams and used as fuel.