Wooden block is spring back to the left, the spring to restore the original length, the acceleration gradually decreased, so A error;
B, according to A in the According to the analysis of A B error;
C, the block of wood in the horizontal direction only by the spring force, according to Hooke's law: the spring force is proportional to the length of the spring compression. When the block to the right when the spring compression, the elastic force gradually increased, according to Newton's second law, the acceleration gradually increased, to do variable deceleration, when the speed is reduced to zero, the speed of the minimum, the maximum elastic force, the acceleration is the maximum, so the C is correct;
D, the wooden block rebound process to the left, the spring restored to the original length, the elastic force decreases, the acceleration is gradually reduced, but the speed gradually increased, just to restore the original length, the maximum velocity, acceleration is minimum to zero, the maximum acceleration. Velocity maximum, acceleration minimum zero, so D is wrong;
The choice of C.
Therefore, the wooden block rebound process to the left.