Which of the following are true about Pyrolysis?

(A) It produces less air pollution than complete incineration.

(B) It is done in the presence of oxygen.

(C) Instead of oxidation a complex series of decomposition and other chemical reactions take place.

(D) Pyrolysis many times generates useful materials.

(E) Pyrolysis is a high temperature thermal process, an alternative to incineration.

Choose the correct answer from the options given below: