Recently, the answers of a test held nationwide were leaked to a group of unscrupulous people. The investigative agency has arrested the mastermind and nine other people A, B, C, D, E, F, G, H and I in this matter. Interrogating them, the following facts have been obtained regarding their operation. Initially the mastermind obtains the correct answer-key. All the others create their answer-key in the following manner. They obtain the answer-key from one or two people who already possess the same. These people are called his/her sources. If the person has two sources, then he/she compares the answer-keys obtained from both sources. If the key to a question from both sources is identical, it is copied, otherwise it is left blank. If the person has only one source, he/she copies the sources answers into his/her copy. Finally, each person compulsorily replaces one of the answers (not a blank one) with a wrong answer in his/her answer key. 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
[1] A [2] B [3] C [4] D
Option: 2
Question: How many people (excluding the mastermind) needed to make answer-keys before C could make his answer-key
[1] 2 [2] 3 [3] 4 [4] 5
Option: 3
Question: Both G and H were sources to
[1] F [2] B [3] I [4] None of the nine
Option: 4
Question: Which of the following statements is true
[1] C introduced the wrong answer to question 27 [2] E introduced the wrong answer to question 46. [3] F introduced the wrong answer to question 14. [4] H introduced the wrong answer to question 46.
Option: 3
Question: Which of the following two groups of people had identical sources I. A, D and G II. E and H
[1] Only I [2] Only II [3] Neither I nor II [4] Both I and II
