At what temperature does the H2S and olefin gases are evolved in the process of carbonisation?

At what temperature does the H2S and olefin gases are evolved in the p

1.	At what temperature does the H₂S and olefin gases are evolved in the process of carbonisation?
A.	700<sup>o</sup>C
B.	450<sup>o</sup>C
C.	270<sup>o</sup>C
D.	110<sup>o</sup>C
Answer» D. 110<sup>o</sup>C