(A) carbonisation of coal (X)
(B) passing steam over incandescent coke (X)
(C) passing air and a large amount of steam over waste coal at about 65°C (X)
(D) partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast ()
(E) same way as the natural gas (X)
Answers: Producer gas is produced by partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast.