To Make Oral Intubation Easier, How Should the Patient's Head

To make oral intubation easier, how should the patient's head and neck be positioned?

A) neck extended over the edge of the bed, with head dangling down
B) neck extended, with head supported by towel and flexed forward
C) both the neck and head fully extended, with neck supported by towel
D) neck flexed, with head supported by towel and tilted back