I say B because if you are the one writing a persuasive essay you should use facts to back up your own thoughts not anyone else's. Another reason you should pick B is because how many times have you wrote a persuasive essay without any factual evidence, that would be just your opinion if you have.
There is no text proving they are right or wrong or a trusted source of information or if they are still publishing. They are called the American vegan society so you can assume they are all about veganism
