Which sentence from the passage indicates that the source is not entirely credible? "The age requirement for voting was enacted after the Civil War by the Fourteenth Amendment, setting the voting age at 21.”
"The Twenty-Sixth Amendment, ratified in 1971, decreased the voting age from 21 to 18.”
"This amendment was proposed in response to the Vietnam War.”
"Since many of those drafted to fight were between 18 and 20, Congress did the right thing by lowering the voting age.”