The effect occurs when solutions emerge for a problem after a period of not consciously thinking about the problem.

The correct answer is incubation.
Incubation effect is when you come up with a solution to the problem, or remember something you were trying hard to remember, after a period of time when you weren't exactly consciously thinking about it. It means that the problem was incubated, but that your brain came up with the solution unconsciously, without your awareness. 

You ser would be coreti