The correct option is A Africa
Human evolution is believed to have started with the early primates around 35 million years ago in the African Savannas. Some of these early primates evolved into monkeys. Some of these monkeys, further, became the common modern monkeys we see today, while the relatives of monkeys which diverged from the common ancestor, evolved into primitive apes. A group of apes split up into 2 - one evolved into the modern gorillas, and the other into the chimp-human ancestor. Then from this group, modern chimpanzees and humans parted ways and evolved into their modern forms. For about 23 million years, the four-legged primates continued to explore different areas of the ground to suit their respective needs. Then, about 7 mya, a branching occurred down the evolutionary line, and some of the primitive apes finally, began to walk on two legs, which was the beginning of bipedalism. This upright posture positively made changes in the nervous systems of these animals, including the increase in brain size. Through this journey of evolution, humans and their ancestors moved across various continents and have evolved into various races that we see today.