Discussion

Explanation:

Let A, B, C and D get the highest to lowest scores in that order.

Consider statement A: A votes for B, B votes for A and C votes for A.

If D votes for A, A wins.

If D votes for B, there is a tie between A and B and A wins as he has the highest score.

If D votes for C/D, A wins.

∴ Statement A alone is sufficient.

Consider statement B: D votes for B. This statement alone is not sufficient.

Hence, option (a).

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