Concept:Increasing computer memory allows the system to hold and process more data at once, which directly improves performance.
Explanation:The overall speed of a computer depends on how quickly the processor can access data and instructions.
More memory size gives the computer extra space to store active programs and files, reducing the need to use slower disk storage.
Faster memory, such as faster RAM, also improves the transfer speed between the CPU and other components.
Devices like large monitors, faster printers, or scanners only improve specific tasks or output quality.
They do not increase the general processing power or speed of the computer itself.
Therefore, the most effective way among the options to enhance computer performance is to increase the memory size.
Answer:D. increasing the memory size