The paper contained 200 questions; so the investigative agency has ruled out the possibility of two or more of them introducing wrong answers to the same question. The investigative agency has a copy of the correct answer key and has tabulated the following data. These data represent question numbers.
Question: Which one among the following must have two sources
Question: How many people (excluding the mastermind) needed to make answer-keys before C could make his answer-key
Question: Both G and H were sources to
 None of the nine
Question: Which of the following statements is true
 C introduced the wrong answer to question 27
 E introduced the wrong answer to question 46.
 F introduced the wrong answer to question 14.
 H introduced the wrong answer to question 46.
Question: Which of the following two groups of people had identical sources
I. A, D and G
II. E and H
 Only I
 Only II
 Neither I nor II
 Both I and II
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