Concept:Each optical instrument has a specific purpose, and its suitability depends on the distance of the object being viewed.
Explanation:The microscope uses a short-focus objective lens and an eyepiece to magnify tiny objects placed very close to it.
This makes the microscope ideal for examining small nearby specimens.
The telescope, by contrast, is designed to collect light from distant objects such as stars, so it is unsuitable for nearby viewing.
The sextant is a navigation instrument used to measure angular distances, not for general viewing.
The periscope uses mirrors to observe objects from a concealed position, which also does not fit the description.
Therefore, when the object is near to the observer, the optical instrument that gives a clear and enlarged view is the microscope.
Hence, the correct choice is the microscope.
Answer:C. Microscope