How does a gear-type pump operate?

A gear-type pump operates by employing two meshed gears rotating within a housing, which is exactly what option B describes. When the gears turn, they create a vacuum that pulls fluid into the pump's inlet. As the gears continue to rotate, they trap the fluid in the spaces between the gear teeth and move it towards the outlet. This mechanism is efficient and provides a continuous flow of fluid, making gear pumps particularly useful in various hydraulic applications.

The other options do not accurately describe the operation of a gear-type pump. For instance, using pistons to compress fluid pertains to reciprocating pumps, which function differently. Magnetic induction is related to electromagnetic principles and does not apply to the mechanics of gear pumps. Lastly, centrifugal force applies to centrifugal pumps, which use rotational energy to move fluid through a system. These distinctions clarify why the operation of a gear-type pump is specifically characterized by the interaction of rotating gears.