"Is There a Relationship Between Adolescents' Learning Style and Their

"Is there a relationship between adolescents' learning style and their academic achievement?" This question is

A) a poor question because it is not clearly stated.
B) a good question because the variables can be operationally defined and the relationship between them investigated.
C) a poor question because the variables could not be clearly and operationally defined.
D) a good question because it is concerned with academic achievement.