Answer:
Black.
Explanation:
The theory of Six Thinking Hats was developed by Dr. Edward de Bono in his book "Six Thinking Hats."
The tool of Six Thinking Hats is useful in making employees think in a new and completely different way.
The six hats that Dr. De Bono proposed were white, yellow, black, red, blue, and green.
The hat that Rafael would wear according to this theory is black.
The black color, according to this theory symbolizes judgment. In this, the employee needs to think about why something won't work. The black hat, on one hand, is the most powerful, if used correctly. This hat helps in analyzing the problems with a certain strategy or difficulties and dangers it might possess. In the given case, Rafael is judging and analyzing that why thanksgiving will not be best for employees.
So, the correct answer is Black hat.