With the development of inventions and discoveries, with the development of the system, the human mind is bound to become more and more open because of this, and the human brain is gradually becoming larger, especially the brain part. At the stage of obscurity, people have to change from nothing. It is extremely difficult to come up with the simplest invention in the environment. Therefore, the slow development of human mind was inevitable at the time. It is of course very difficult to organize such a group of people who have begun to be ignorant and unruly and form a society. There is no doubt that the earliest invention projects, the earliest social organizations, are difficult to produce, so the transition from the obscure stage to the barbaric stage takes the longest. What is the most accurate rephrasing of this passage? ['The invention, the creation of discoveries, and the establishment of the social system all started at the obscurity stage, but because it is very difficult from scratch, the obscuration stage is particularly long.', 'Invention, the creation of discovery, and the establishment of a social system are the beginning of the barbaric phase. In the obscured phase, all these are very difficult, so the obscured phase is particularly long.', 'In the obscurity stage, human beings have no inventions, discoveries, and systems at all. These three are necessary conditions for the beginning of a barbaric society, so there is a considerable interval between the three.', 'Difficulties in discovering and establishing the system through the obscuration stage, explaining the reason for the retarded intellectual development of primitive people.']