Which of the Following Is Correct About Pumice

Multiple Choice

Which of the following is correct about pumice?

A) Frequently found in block form,which is then run onto a rag wheel to polish precious and semiprecious metal alloys in the laboratory
B) Used in coated disks and bonded rotary devices primarily used in finishing procedures
C) A major component of many prophylaxis pastes used to polish tooth structure,dental amalgam,and acrylic bases
D) Used to smooth enamel,or finish metal alloys and ceramic materials