Which source is most credible?
an article in a recent government publication
describing who can vote in the US
an opinion piece by a teenager wanting to lower the
voting age to 14
an interview with voters on election day
an advertisement for registering to vote
Explanation: the rest of the choices are either opinionated (coming from one source that is not factual). The voting age to 14 is a factual nation-wide known fact that states the official voting age in the US.