I would say that it is the third one.
This was astrolabe; an instrument to predict the position of the stars, that could also be used to predict t one's position. The compass was invented in China.
The correct answer in the missing blank is known as "separation".
The six degrees of separation is known as a theory in social networking wherein it states that a person can be connected anyone in the world, no matter how far, through a process of acquaintances, which possesses not more than five mediums.
The school psychologist visits the class one day to observe
Your answer would be the, The Wealthy, and Businesses.
Hope that helps!!!
