Final answer:
The person sitting at the extreme right is D.
Step-by-step explanation:
To determine who is sitting at the extreme right, we need to consider the statements given. Statement I tells us that C is to the left of D, while Statement II tells us that B is to the left of A. From these statements, we can conclude that the order from left to right is B, A, C, D. Therefore, D is sitting at the extreme right.
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