A3. What is the maximum number of different triangles you can draw if you take any three of five marked points on a circle as vertices?
(A) 7
(B) 8
(C) 9
(D) 10
(E) 11

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A3. We mark the points on the circle as $A, B, C, D$ and $E$. If we write down all the different possible triangles: $A B C, A B D, A B E, A C D, A C E, A D E, B C D, B C E, B D E, C D E$, there are 10.