which piece of evidence could persuade a reader to support a claim that middle-school students should be required to wear uniforms?

a school uniforms can be ordered online, which is much easier than going to a store
b in a school district that recently made school uniforms a requirement, attendance rates, and grades have increased
c compared to the cost of regular clothes, the cost of uniforms is often quite less
d when everyone looks the same in their uniforms, students begin to lose their uniqueness

b in a school district that recently made school uniforms a requirement, attendance rates, and grades have increased