Robert Cialdini (2008) illustrated six principles that underlie human relationships and human influence in his book Influence: Science and Practice. In this context, when people feel obliged to repay in kind what they have received, it is known as the .

Reciprocity

Explanation:

Reciprocity is one of the principles that undeliez human relationship s and influence illustrated by Robert Cialdini in his book and it talks about doing what is good and right so as to get the same in return, it emphasizes on the fact that you receive what you dish out.

Is known as Reciprocity.

Explanation:

Reciprocity is, in a nutshell, the response of positive action with an equally positive one. According to Robert Cialdini's theory, Reciprocity is the first of the six principles in the human relationship. Reciprocity is responsible to establish and develop all the following principles to create a good relationship between people.

sumerians were polytheistic, meaning they believed in many different gods. so, the best answer is c.