Final answer:
The stage where individuals temporarily walk away from a problem is called the Incubation stage.
Step-by-step explanation:
The stage where individuals temporarily walk away from a problem is called the Incubation stage. This occurs during the problem-solving process, where individuals take a break from actively thinking about the problem and allow their unconscious mind to process and generate new insights or solutions. For example, if a student is stuck on a difficult math problem, they might walk away from it for a while and engage in a different activity like going for a walk or listening to music. This break can provide the mind with the opportunity to make connections and come up with fresh perspectives when they return to the problem later. Therefore, the correct answer to the question is: a) Incubation.