In the passage, chip refers to D. a small silicon piece with an electronic circuit.
What chip refers to
The other options are incorrect because while wires are important for connecting components, they wouldn't be described as a "chip" and wouldn't need to be replaced to get the computer running again.
Also, Inlets are ports, not chips, and would not be replaced to fix a computer's internal functionality. While fans are important for cooling, they wouldn't be referred to as a "chip" and wouldn't stop the computer from working if damaged.
Based on the context of needing to replace a crucial component for the computer to function, a small silicon piece with an electronic circuit is the most accurate description of the chip in the passage.