Gilbert Has Trouble Listening to the Teacher's Instructions Because It

Gilbert has trouble listening to the teacher's instructions because it would require that he sit still. He often has trouble with the teacher's commands because he is distracted by all of the surrounding noise. He has trouble staying in his seat, and often wanders around in the classroom. Gilbert most likely has which of the following?

A) Expressive language disorder
B) Attention deficit/hyperactivity disorder
C) Receptive language disorder
D) Voice disorder