Answer: Incubation
Explanation: In simple words, incubation refers to a process to keep something under right conditions so it can develop properly.
In the given case, Michael had to solve a problem and was confused about the alternative solution he had. Thus, he tried a different approach by standing back and thinking the best solution about it.
Thus, from the above we can conclude that the correct option is D as he tries to put the problem in right condition so it can be solved properly.