The position or manner of use of an instrument is described by:: (A) Class, (B) Suborder, (C) Subclass, (D) Order
Answer is B. Dr  Black  prescribed  four  classes,  similar  to  a  biological classification: 
Order - Purpose of instrument 
Suborder - Position or manner of use 
Class - Form of working end 
Subclass - Shape of the shank.