Classifying polymers according to their mechanical behavior, they can be subdivided into elastomers and plastics. Plastic polymers come from the su...

Classifying polymers according to their mechanical behavior, they can be subdivided into elastomers and plastics. Plastic polymers come from the sum of several monomers and can be thermosetting or thermoplastic. Read the sentences below and then choose the correct alternative.
I. Plastic polymers are produced from petroleum.
II. Thermosetting polymers are those that become malleable at high temperatures, making recycling possible.
III. Thermoplastic polymers are those that become malleable at high temperatures, making recycling possible.
IV. Thermosetting polymers are those that become rigid at high temperatures, making recycling impossible.

I. Plastic polymers are produced from petroleum.
II. Thermosetting polymers are those that become malleable at high temperatures, making recycling possible.
III. Thermoplastic polymers are those that become malleable at high temperatures, making recycling possible.
IV. Thermosetting polymers are those that become rigid at high temperatures, making recycling impossible.
A) As alternativas III and IV are incorrect.
B) I, II, III and IV are correct.
C) Only alternative II is incorrect.
D) All alternatives are wrong.
E) Alternatives I, II and III are correct.