Answer:
I believe the answer is persuasive.
Step-by-step explanation:
Well we can for sure cross off Expository( it is written with facts no opinions involved), Comparison and contrast( It is compering one information with another, which you have to show the difference with facts and not your opinion), and descriptive( it is just giving info more details to let the reader picture it more).
So that only leaves us with Persuasive. Which makes sense because if you are doing a document of dogs vs cats (Saying which is better to have as a pet) and in your opinion; let's say you like cats, you need to use your opinion and some facts to persuade the person into liking cats.