What Is Meant by the Slippery Slope Metaphor Is That

What is meant by the slippery slope metaphor is that

A) acts of corruption can slip under the radar of the administration because only line officers are involved.
B) anyone can slip if the opportunity presents itself.
C) the first illegal acts committed by an officer should be forgiven, especially if the officer is new on the force.
D) after committing minor acts of corruption, it becomes easier to commit more serious wrongful acts.