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Answer:
The correct answer is A. nosepiece.
Explanation:
The correct term is "nosepiece." In the context of the statement, a nosepiece is a component typically found in microscopes. It holds two or more objective lenses, which are the lenses that magnify the specimen being observed. The nosepiece can be rotated to switch between these lenses, allowing the user to change the magnification power without having to remove and replace the lenses manually. This feature is essential for examining specimens at different magnification levels and for achieving clearer and more detailed images during microscopic observation.