For a long time, scientists have been searching for the answer to a question: what exactly gave the earth enough oxygen to allow it to breed animals and humans. The occurrence of oxygen in the earth's atmosphere occurred 2.4 billion years ago. About 4.7 Million years ago, moss-like ground cover plants spread rapidly on the earth. It was not until 400 million years ago that the oxygen content of the earth's atmosphere reached today's level. Therefore, some scientists believe that the increase in the earth's oxygen originated from moss-like ground cover plants. Which of the following items, if true, best support the views of the scientists mentioned above. ["The earliest terrestrial plants appearing on Earth are unexpectedly prolific, they have greatly increased the oxygen content in the earth's atmosphere.", 'It can be estimated through computer simulation: about 445 million years ago, the oxygen produced by lichens and moss on the earth accounted for 30% of the total oxygen.', 'The spread of moss-covered plants has increased the organic carbon content of sedimentary rocks, which has led to an increase in the oxygen content of the air.', 'Increased oxygen content makes it possible to evolve large, mobile, and intelligent creatures, including humans, on Earth.']