Lamont designs a survey of town residents in an attempt to predict who will be elected mayor. He chooses his sample of 500 people from the town's 40,000 residents by asking his question to every person leaving the public library on a Saturday. Which suggestion would most improve Lamont's random sample? Lamont should sample only adults. Lamont should sample only registered voters. Lamont should decrease the sample size. Lamont should ask every fifth person.