Understanding What the Human Psyche Was Designed to Do Can

Understanding what the human psyche was designed to do can help us to understand human behaviour in the same way that ____.

A) reading a product manual can help us understand what a product will do, and how it will react when treated in different ways
B) reading a book report can help to shed light on, and elaborate upon, the ideas presented in a book
C) explaining an idea to someone else can help us to better understand the idea ourselves
D) determining the character of a person is largely based upon what kinds of friends that person has