阅读选择：阅读下面短文，请从短文后所给各题的四个选项(A、B、C、D)中选出一个最佳选项。

     Man’s mind is his tool of survival. The mind is used to gain, use, store, and recall knowledge. It is his mind that enables a farmer to know what to plant, when to harvest it, how to prepare food from the result. It is his mind that enables a hunter to know what he needs to make a spear, how to make it, and how to use it. And it is his mind that enables a blacksmith to know how to make iron tools. In short, it is the mind that enables a person to know what to do in order to survive.
     Man’s mind allows long-range planning and thinking. It enables such long-range planning as required for farming, hunting, and tool making. These efforts require the ability to form concepts of long-term cause and effect chains. “I need to make a spear tonight so I can hunt tomorrow and have food for the next 7 days.” There may be environments where people could survive for a while without long-range planning, but without the results of knowledge like spears, fire, and other technologies, people would get out — bred by other animals and die out.
     Man’s mind is his tool for survival, but like all tools, it must be properly used. The mind makes good use of knowledge, and knowledge can only be obtained through reason. Without reason, there is no knowledge, and thus no survival.
     You must recognize reality and act in accordance with it in order to be successful. To the extent that you use reason as your method of judgment in knowledge and action, you will survive and flourish. If you ignore or escape from reality you will suffer and die.
     It is very important to note that survival by reason requires the freedom to act according to your reason. That is why people do not develop well in the control of others, and cannot survive when they are subject to force that destroys their ability to act on reason.