At what age must all men register for the Selective Service?

• A. Sixteen
• B. Eighteen
• C. Nineteen
• D. Twenty-one

Answer: (B)

The correct answer is eighteen because, in the United States, federal law requires that all male citizens and immigrants residing in the U.S. must register for the Selective Service within 30 days of their eighteenth birthday. This system is in place to provide the government with a list of individuals who can be called upon in the event of a military draft. Registering at eighteen ensures that young men are counted in case the nation needs to mobilize additional forces for military service.

The other ages listed do not align with the current legal requirements. Sixteen is too early, as individuals can only register once they reach eighteen. Nineteen and twenty-one are also incorrect because the legal obligation to register begins at eighteen, not later. Therefore, understanding the significance of the age of eighteen in this context is crucial for recognizing civic responsibilities in the U.S.