Answer: Organs are grouped into organ systems, in which they work together to carry out a particular function for the organism. For example, the heart and the blood vessels make up the cardiovascular system.
The answer would be:
A. Mysterious self.
Here's is more about Johari's Window:
This is a model that helps understand how you communicate with others. It is divided into 4:
Open self - This refers to things about you that you and others know.
Hidden self - This refers to things about you that you already know but others do not.
Blind self - This refers to things about you that you do not know but others observed.
Unknown self - Things about you that you and others have yet to discover.