Which best describes a ceiling effect? Let's say that my aunt Sueanne sees an ad about Diet Coke. If there was a ceiling effect:

The ad won't make her like Diet Coke more because she hates Diet Coke with a passion.

The ad will make her like Diet Coke more, but it won't take effect until at least a day later.

The ad won't make her like Diet Coke more because she already likes Diet Coke so much.