A Clinician Is Removing Calculus from the Lingual Aspect of the Client's

A clinician is removing calculus from the lingual aspect of the client's maxillary anterior tooth surfaces away from the 12 o'clock position. The clinician's head is bent forward, and the clinician is leaning toward the client. What correction should the clinician make for an ergonomic body position?

A) Move around to the side of the client
B) Raise the client's chair back to a 45-degree angle
C) Ask the client to change from the chin-down to the chin-up position
D) Raise the entire client chair so that the client's mouth is closer to the clinician