Answer:
Low memory?
So to fix the problem you could add more memory to the machine.
Explanation:
1 - b - Excel is a computer program, so it'd be Software
2 - a - Process of elimination, haven't heard of the term 'peopleware' before.
3 - d - A joystick accepts input from a user to interact with a computer. ex. Flight Simulators
4 - c - A monitor will display (or output) an image based on what is received from the computer.
Google Analytics, this is a common one but there are others that do the same thing.
The answer is A, or Locating bottlenecks in a network.