Manufacturing Aluminum

The Aluminum Company of America (Alcoa), the sole producer of aluminum in the United States until the 1940s?
controlled almost all sources of bauxite in the United States.
A. It is less expensive for one producer to manufacture aluminum than for many producers to do so.
B. Alcoa has control over a key resource.
C. The government gives Alcoa the exclusive right to produce aluminum.
I thought they were able to become a monopoly based on thier patented technology that made aluminum far cheaper than anyone could.
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