Answer:
b. blue lies
Step-by-step explanation:
Blue lies are the ones between what we know as "black lies" (lie in the very sense of the world, anti-social behavior) and "white lies" (considered to be harmless and said in a good manner). It is for the good cause but usually said on the damage of someone or something. As such, blue lies are ones usually told by the police (hence the name) when they want to control the situation and the person in question, as the police can use broader concepts of what is moral and permitted