if two option are correct choose both of them
Extracted text: Q9. "Maserati Boomerang" could only appeared in 1970s James Bond movies instead of being mass-produced due to A. Repair and maintenance limitations for composite components in the 1970s. B. Stainless steel was not invented yet in the 1970s. C. Cars made of materials with matrix and reinforcements are not worth the money in the 1970s for average men. D. Copper alloys were too expensive in the 1970s.