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.