A, B, C and D are to be seated in a row. But C and D cannot be together. Also B cannot be at the third place.
If A is not at the third place, then which of the following options does C have?
If A is not at the third place, then it has only two choices either 2nd or 4th position
So if A is at 2nd position, then B has only fourth position as choice and C can have either first or third position.
And if A is at 4th position, then B has only 2nd position and again C can have either first or third position.
Hence answer will be C.
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