What is the probability of randomly selecting one of the shortest diagonals from all the diagonals of a regular 7-sided polygon)?  Pick:
A) 1 / 2  B) 1 / 3  C) 1 / 4  D) 1 / 6  E) 1 / 7

Rationale: "from any vertex , there are two vertices on sides , which do not make a diagonal but a side . so the remaining n - 3 vertices make diagonals . there are 2 of these diagonals which are the shortest . the probability of choosing one of the shortest diagonals is 2 / 4 = 1 / 2 . the answer is a ."
Answer: A