Which of the Following Will Minimize Backflow of Anesthetic Solution

Which of the following will minimize backflow of anesthetic solution in a PDL injection?

A) Reduce the depth and pressure of penetration to avoid backflow away from the bone.
B) Increase the depth of penetration to block the flow of solution away from the deposition site.
C) Use a shorter needle and insert to the hub.
D) Use a 30 gauge needle to control the rate and amount of solution deposited under pressure in tight spaces.