Which contribution would be relevant to a group discussion about school uniforms?

A.Do you agree that our school colors are ugly? Let’s talk to the principal about having an election to change them.

B.Have you seen the new jeans style on sale at the mall?

C.I think we should be able to take classes in fashion design along with English and computer science in school.

D.I think school uniforms would make it easier to concentrate on classes instead of thinking about what everyone is wearing.