Answer:
The correct answer is letter "E": preparation and incubation.
Step-by-step explanation:
English professor Graham Wallas (1858-1932) proposed a model to explain the steps the human brain follows in the creative process. Those steps are preparation, incubation, illumination, and verification. In the preparation stage, individuals define a problem and its dimensions. In the next step, incubation, the problem is analyzed only internally for reflection.