Q.1 The work space of the first person is very stuffy, and the guy has to shift uncomfortably. Also, when he wants to lean back, he broke the chair he was sitting on. The lighting of his workspace was also bad as when he wants to shift a lamp, it is too hot and the other lamp is affecting the brightness of his screen. The guy also has neck aches from looking too much at the laptop screen.
The second person's workspace is spacious and his chair is also very comfortable. he can shift his body posture with ease and the hand support can also be shifted easily. His screen can also be shifted. He also have a laptop holder that he can use to look at the screen comfortably. The lamp he is using will not heat up easily, so he can shift it without burning his hands.
Q.2 The workspace that the second guy is working in is more preferred as it has a comfortable chair, spacious tables, adjustable lights that will not heat up easily, and a laptop holder that increases the height of the screen, with adjustable armrests that allow him to work comfortably.
Q.3 We need to look at his criteria and his "comfort level" to suit his needs, for example, the price, the type of armrests, and other factors affecting the person both physiologically, and physically.
Q.4 Because ergonomics affect the quality of their work and also their eagerness and stamina/strength to work.