Task: Question Answering
Input (English): Question: If x = a/3 + b/3^2 + c/3^3, where a, b, and c are each equal to 0 or 1, then x could be each of the following EXCEPT:

 Option A: 1/27

 Option B: 1/9

 Option C: 4/27

 Option D: 2/9

 Option E: 4/9
Output (English): Option D