The text that most clearly has an agenda is: D. An advertisement for an app offering five free Spanish lessons, after which students must pay to subscribe.
Depending on the context, an agenda could be described as a list of activities or the secret aim of an activity.
The advertisement has a secret aim which is getting students to subscribe. So, option D is right.
Learn more about an agenda here:
https://brainly.com/question/7044416