Which of the Following Decreases the Rate of Abrasion

Multiple Choice

Which of the following decreases the rate of abrasion?
1) Use of a dry abrasive.
2) Use a firm pressure.
3) Increase the speed of the handpiece.
4) Use a lot of abrasive material.
5) Use of a small grit abrasive material.

A) 1, 2, 3, 4, 5
B) 1, 2, 4, 5
C) 5 only
D) 1 only