Swinging balls

As shown above, several polished steel balls(with the same mass) are hanged in a straight line in contact with each other. Suppose that the ball \(A\) is pulled back to the height of \(h\) to the left and allowed to strike the line. Which of the following statements is correct?

a) Right after the collision between the ball \(A\) and ball \(B\), the ball \(G\) flies to the height of \(h\) to the right.

b) If we pull back the balls \(A\) and \(B\) to the height of \(h\) to the left and allow them to strike the line, then the ball \(G\) flies to the height of \(2h\) to the right.

c) If we pull back the balls \(A\), \(B\) and \(C\) to the height of \(h\) to the left and the balls \(F\) and \(G\) to the height of \(h\) to the right, and allow them to strike the line simultaneously, then the ball \(D\) will not move.

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