Final answer:
To score the skin of an orange, a knife should be used for precision and control. A grater, whisk, or fork are not suitable for this task, as a knife provides the necessary sharp edge for scoring.
Step-by-step explanation:
The kitchen tool you would use to score the skin of an orange is a knife. Scoring is a technique used to make shallow cuts on the surface of food items. When scoring the skin of an orange, a knife allows for precision and control, enabling you to make the decorative cuts without cutting too deeply into the fruit.
While a grater could potentially damage the orange by removing too much zest and a whisk or fork wouldn't provide the needed sharp edge, a knife's blade is perfect for this task. Whether you are using the scoring for decorative purposes or to help in peeling the orange, a sharp paring knife or a utility knife would be the best choice.