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The wording in the second statement is a little confusing.
They are two halves of the same circle?
Does that automatically imply that the triangles two sides must be the diameter or not?? Or is it still possible that we need the extra info given in statement A, because the side may not be the diameter after all?
I am not able to decide between B and D. On first reading I would have said D, but perhaps it should be B.