The civic duty required by U.S. law for 18-year-old male citizens is C) registering with Selective Service.
What is the Selective Service?
The Selective Service as an independent agency of the United States government keeps records of citizens subject to military conscription during emergencies.
In this regard, all male U.S. citizens and immigrants must register with the Selective Service within 30 days of turning 18 years or of arriving in the U.S.
Thus, the civic duty required by U.S. law for 18-year-old male citizens is C) registering with Selective Service.
Learn more about registering with the Selective Service at https://brainly.com/question/5033873
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