Final answer:
Copyrights are granted for the life of the creator plus 70 years.
Step-by-step explanation:
A copyright, according to the U.S. Copyright Office, is a form of protection provided by the laws of the United States for 'original works of authorship' including literary, dramatic, musical, architectural, cartographic, choreographic, pantomimic, pictorial, graphic, sculptural, and audiovisual creations. Copyright protection ordinarily lasts for the life of the author plus 70 years. Therefore, the correct answer is option c) for the life of the creator plus 70 years.