Answer:
School uniforms benefit student learning in classrooms.
Step-by-step explanation:
The positive connotation of a Diction affiliate to the choice of words or sentences concerning the effective communication that assists the readers to form a positive attitude or opinion towards it contrary to the negative one. The sentence that justifies the above claim is the third option i.e. 'School uniforms benefit student learning in classrooms'. The diction used in the other options clearly exemplifies the negative connotation as it instigates the readers to form a negative attitude and discourage them to understand the benefits of school uniforms. Thus, the third one is the answer as it encourages the readers positively.