What is the main source of raw material for the production of plastics?
A B C D
clay plants petroleum sand
Question: What is the main source of raw material for the production of plastics?
(A) clay
(B) plants
(C) petroleum
(D) sand

Answer: (C) petroleum
Answer: (D) sand
Question: What is the main source of raw material for the production of plastics?
(A) clay
(B) plants
(C) petroleum
(D) sand
Answer: (C) petroleum