Your physician tells you to get more exercise. The same day, on a late-night infomercial, your brother watches a washed-up celebrity tell the public they need to get more exercise. According to research on the sleeper effect, who is more likely to be thinking about buying a gym membership about a month later?
选项：

A: You are
B: Your brother is
C: Neither you nor your brother
D: Both you and your brother