Which of the following groups is an example of the basic unit you selected in the previous question

I apologize, but I don't have enough information to understand which previous question you are referring to. Could you please specify the basic unit you are asking about?

To provide a specific answer, I would need to know the previous question and the options you are referring to. Could you please provide more context or specify the options?

To determine which of the provided groups is an example of the basic unit we referred to in the previous question, we first need to know what is meant by "basic unit."

Unfortunately, you haven't provided any information or context about the previous question or the term "basic unit." Could you please provide more details or specify what you mean by the "basic unit" so that I can assist you accurately?