Now we have three green cars. We know that car 4 can still never be green. At most, one of car 5 or 6 can be green because greens can’t be together.
That means there will be two greens in front of car 4. We must put them in cars 1 and 3, so they won’t be together. Then green can be either 5 or 6. D is CORRECT. 1 and 3 are the only places that absolutely have to be green.


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