Two of our rules give us scenarios where only one sequence is possible. If P goes in 1 then Y is in 2. That forces G into 3; if 3 were P or Y then spot 2 would have to be P.
A is CORRECT. If light 1 is purple then 2 has to be yellow and 3 has to be green.
The other scenario where everything is settled is the second rule: if G goes in 2 then G has to be 3 for the same reason. But this isn’t among the answer choices.
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