What Is the Main Idea of the Cooperative Principle

What is the main idea of the cooperative principle?

A) We must be understanding of the differences of how others express themselves through verbal communication.
B) We must understand that there is an element of mystery to any message.
C) We must respond to conversations in ways that others expect as determined by the type or nature of the conversation.
D) We must allow for misunderstandings in communication and be cognitively complex in our approaches.