There are two opposing views about the origin of Modern man. According to one view, Homo erectus in Asia were the ancestors of modern man. A study of variations of DNA, however, suggested African origin of Modern man. What kind of observation on DNA variation could suggest this?

The observation that suggests the African origin of Modern man is the greater variation in DNA in Africa than in Asia. This is because the African population is older and has had more time to accumulate genetic variations. Think of it this way: if a population has been present in a region for a longer time, it will have more time to accumulate genetic mutations, which will result in greater genetic variation. In other words, the greater variation in Africa suggests that the African population is the oldest, and therefore, it is the origin of Modern man. So, the correct answer is option A. Notice that options B, C, and D do not support the African origin of Modern man.