Upon turning 18, all male citizens of the united states are obligated to a) join the army. b) register to vote. c) register with selective service. d) get their driver’s license.

C) register with Selective Service.

Explanation:

By law, all male citizens, residents, legal or not, in the United States have to register for selective service within 30 days of their 18th birthday, selective service is where the american army drafts the men that would be called for battle if there is an event of war, or if they are needed, failing to register to the selective service is a felony, and it is punishable with up to $250,000 in fines.

d. william mckinley's southern upbringing him win.