________ pumps are useful for pumping viscous liquids or slurries, but highly viscous liquids would require relatively large, slow moving pumps to keep N.P.S.H.A greater than N.P.S.H.R?

________ pumps are useful for pumping viscous liquids or slurries, but

1.	________ pumps are useful for pumping viscous liquids or slurries, but highly viscous liquids would require relatively large, slow moving pumps to keep N.P.S.H.A greater than N.P.S.H.R?
A.	Gear
B.	Teeth
C.	Tubing
D.	Lobe
Answer» B. Teeth