A block of mass \(m\) is attached to an ideal horizontal spring with spring constant \(k\). The other end of the spring is fixed to a wall. The block is pulled to a position \(x = +A\) and released from rest at time \(t = 0\). Friction between the block and the horizontal surface is negligible. Which of the following graphs best represents the acceleration \(a\) of the block as a function of time \(t\) for one complete oscillation?