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Explanation:

From Ganeshan’s statement, there were two candidates in room 102. From Erina’s statement, she was the only candidate in her room.

However, from Balram’s statement, there were at least three candidates in the room 101. Therefore, there were 4 candidates in room 101, 2 candidates in room 102 and 1 candidate in room 103.

Using the given statements, we can generate the following:

​​​​​​​​​​​​​​

Now all the questions can be answered.

Hence, option (a).

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