Which text most clearly has an agenda?
O A. A video that follows a herd of elephants for a year as they travel
across the African grasslands
O B. An article that describes the pros and cons of trying to build a
colony on each of the solar system's planets and moons
O C. An essay that gives details about a historical figure's rise from a
childhood of great challenges to a successful career
D. An advertisement for an app offering five free Spanish lessons,
after which students must pay to subscribe