Why was it decided to lower the voting age to 18 from 21?

The voting age was lowered to 18 largely because young men could be drafted to serve in the military at that age but could not vote on the leaders making decisions about war. The argument was often summarized as “old enough to fight, old enough to vote.” This matches choice C: it was unusual that 18-year-olds could be drafted but could not vote.

AI-written and checked against the verified answer.