Correct Answer:
A. Cut
The correct answer is Cut. This is an analogy question. The relationship between "Microscope" and "Magnify" is that a microscope is a tool used to magnify (the function). Similarly, a knife is a tool used to cut. Among the options:
- Cut: This is the primary function of a knife, matching the analogy.
- Sharpen: This is what you do to a knife, not what it does to something else.
- Slice: This is a specific type of cutting, but "cut" is the more general and direct function.
- Break: Not a function of a knife.
Hence, the correct answer is "Cut".