The U. S. government protects fish, a common resource, by A. heavily taxing competing industries. B. subsidizing the fishing industry. C. selling fishing licenses and regulating fish lengths. D. None of the above is correct.

The U.S. government protects fish, a common resource, by selling fishing licenses and regulating fish lengths

Explanation:

When there is regulation about a particular goods, it reduces the rate the availability of such goods is abused, US government could actually protect fish through licensing and regulation of the type to be sold including there length which ensures the protection of the juvenile.