Which One of the Following Is an Indication for Using

Which one of the following is an indication for using a standard ultrasonic insert?

A) Generalized tobacco stain or localized light subgingival moderate calculus in a child
B) Moderate to heavy supragingival calculus in a young adult,accompanied by tobacco stain
C) Fine subgingival deposit in deep periodontal pockets and intrinsic tooth stain
D) Light generalized tobacco stain and fine subgingival scaling generalized in the mouth of a senior citizen