Hint: The oldest known species to have a human-like body is Homo erectus. This hominin is considered our closest relative. It had shorter arms and longer legs compared to its torso and most importantly had an upright posture. They are believed to have lived across continents of Africa, Asia, and Europe.
Complete answer: Solo Man is a subspecies of the extinct group of human species Homo erectus. It has been named as Homo erectus soloensis. Initially, it was named as Javanthropus and considered a subset of Homo sapiens because of its striking resemblances with the modern man. However, later they were segregated from Homo sapiens and included in Homo erectus. Their fossils have been excavated from Ngandong village on the banks of the Bengawan Solo River in Java, Indonesia. The excavations were carried out between 1931-1933 by Gustav Heinrich Ralph von Koenigswald. He found 11 partial skulls and 2 leg bones of primitive H. erectus. They had a cranial capacity of 1,150–1,300 cc. and were considered as larger-brained representatives of its species. The skulls were somewhat flat in shape and had thick bones. The brow ridges were heavy and prominent. The skull bases were broken and were without facial bones. The leg bone i.e. tibia was quite like human bones. It is estimated that the Solo Man lived on this planet about 1.5 million years ago in the region of Java. So, the correct answer is “Option A”.
Note: The Solo Man had an advanced culture as tools made of crude stones, bones, and horns were also discovered along with their fossil remains. These materials are supposed to be 50,000 to 60,000 years old.