Why are efforts to enter such industries as commercial aircraft or household laundry equipment so rare?单项选择题

A

The industries are allowed by the government to have pure monopolies.

B

The industries are heavily regulated, making the necessary licenses difficult to secure.

C

The industries require economies of scale to be profitable, which is expensive and risky to establish.

D

The industries are limited by the government to a fixed number of independent companies.

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