Answer:
A scientific article on the benefits of school uniforms would be the most useful source for a persuasive essay with this thesis.
Step-by-step explanation:
In a persuasive essay you need to support your thesis and give factual proof of your theories as you want to convince people to adopt your point of view, from the given options a scientific article is the one that has a better fundament in matter of proof and reliable information about the topic, the other options are either too informal or outdated.