Which of the Following Guidelines Correctly Recognizes the Importance of Ease

Which of the following guidelines correctly recognizes the importance of ease of access as well as ergonomics when administering PDL injections?

A) For maxillary teeth, select sites on the lingual because the embrasures are larger.
B) For mandibular teeth, select sites on the facial for better access.
C) Prevent blanching whenever possible to relieve hand stress.
D) When blanching is observed circumferentially around the tooth, no more penetrations are necessary.