Explanation:
During human evolution, several species and subspecies roamed on earth and lived together and also possibly exchanged genes, thus, obscuring the exact lineage which ultimately evolved into modern humans, but Homo erectus that lived around middle Pleistocene, are thought of as the direct line that evolved into modern man. The most important subspecies of Homo erectus are Java man, Peking man and Heidelberg man.Hence, the correct option is (A).