SK Manufacturing Group is a firm based in California that produces rail locomotives. The firm does not need to depend on imported bearings, axle cars, and streamliners as there are many firms in the U.S. that manufacture these equipments. The easy availability of components has fuelled the firm's growth. According to the diamond model, SK Manufacturing Group benefits from:
A. firm rivalries.
B. demand conditions.
C. related and supporting industries.
D. firm strategies.
E. firm structures.
Answer: C. related and supporting industries.