In the era of fragmentation, people's attention is difficult to last. Letting users stay longer on email pages has become the direction of marketers. With the gradual popularity of rich media, emails have gradually changed from a single static to a dynamic, personalized The characteristics of emails are also gradually emerging. GIF production is simple, strong compatibility, and can increase visual impact in emails. Therefore, inserting GIF dynamic pictures in emails can more attract users' attention and increase user click-through rates. Which of the following, if true, best supports the above conclusion? ['If personalized marketing emails are tailored to specific user groups, sales opportunities will increase by 20%.', 'Personalized marketing emails without GIF dynamic pictures in the past have also brought success to many businesses.', "People born in the 1970s are accustomed to the static interface of email and don't like gaudy things.", 'Personalized marketing emails that insert GIF dynamic pictures can bring enterprises 18 times more income than ordinary emails.']