A survey of address changes filed with post offices and driver' s license bureaus over the last ten years has established that households moving out of the city of Weston outnumbered households moving into the city two to one. Ttherefore, we can expect that next year' s census, which counts all residents regardless of age, will show that the population of Weston has declined since the last census ten years ago. Which one of the following, if true, most helps strengthen the argument? ["Many people moving into Weston failed to notify either the post office or the driver's license bureau that they had moved to the city.", 'Most people moving out of Weston were young adults who were hoping to begin a career elsewhere, whereas most adults remaining in or moving into the city had long-standing jobs in the city.', 'Over the past century any census of Weston showing a population loss was followed ten years later by a census showing a population gain.', 'Most adults moving out of Weston were parents who had children living with them, whereas most adults remaining in or moving into the city were older people who lived alone.']