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Two straight lines intersect at a point O. Points `A_1, A_2 ..., A_n` are taken on one line and points `B, B_2, ..., B_n`, on the other. If the point O is not to be used, then the number of triangles that can be drawn using these points as vertices, is

A

`"^nC_2+^mC_2`

B

`"^(2n)C_2`

C

`"^(m+n)C_2`

D

none of these

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The correct Answer is:
D
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