Why is this a scientific question? "Do people perform better on exams when they wear their favorite color?" The question is not specific. The question reflects an opinion. The question can be tested by a systematic procedure. The question asks about phenomena that cannot be measured.

The question "Do people perform better on exams when they wear their favorite color?" is a scientific question because it can be tested by a systematic procedure. This means that the question can be investigated through controlled experiments or observations, and the results can be measured and analyzed. The other options are not reasons why this is a scientific question. The question is specific, it does not reflect an opinion, and it asks about phenomena that can be measured.