Which mathematical equation equals 4?

A) 2 + 2
B) 2 + 2
C) 3 + 1
D) No correct choice (Mathematically impossible)
E) None of the above
F) All of the above (A, B, C, D, E)
G) What a stupid question

Analysis:
'A' is correct
'B' is correct
'C' is correct
'D' is incorrect, since 'A', 'B', 'C' are correct
'E' is incorrect, since 'A', 'B', 'C' are correct
'F' is incorrect, since 'D' and 'E' are incorrect
'G' could theoretically be correct, but it's a
   stupid answer to a stupid question, so we'll
   say it's incorrect

So... 'A', 'B' and 'C' can be said to be correct.
  But 'A' nor 'B' can be correct because they are the
  same and both say there is only one answer, which is
  incorrect. Therefore, 'C' MUST be the correct answer!!

Correct answer to this question: C
Therefore, correct answer to poll:
   *** More than one correct choice ***