To answer this question, let's go through each option to understand why it is correct or incorrect:
Option A) Data inadequate - This option is correct because the given information does not provide enough clues to determine who is at the extreme right.
Option B) G - This option is incorrect because there is not enough information given to determine if G is at the extreme right.
Option C) B - This option is incorrect because there is not enough information given to determine if B is at the extreme right.
Option D) None of these - This option is incorrect because the given information does not allow us to determine who is at the extreme right.
The correct answer is A) Data inadequate.