You Are Training a Rat to Press a Bar

You are training a rat to press a bar. Instead of waiting for the rat's first accidental bar press, you reinforce the rat with a food pellet for facing the bar and then turning toward the bar. Next, you reinforce the rat every time he takes a step toward the bar, until he touches the bar. Lastly, you reinforce the rat for pressing the bar. You are

A) using latent learning to train the rat.
B) fading the rat's behavior.
C) shaping the rat's behavior.
D) using secondary reinforcement with the rat.