单项选择题

In 776 BC, the first Olympic games were held at the foot of Mount Olympus to honor the Greeks’’ chief god, Zeus. The Greeks emphasized physical fitness and strength in their education of youth. Therefore, contests in running, jumping, discus and javelin throwing, boxing, and horse and chariot racing were held in individual cities. The participants competed every four years at Mount Olympus. The winners were greatly honored by having olive wreaths placed on their heads and having poems sung about their deeds. Originally, these were held as games of friendship, and any wars in progress were stopped to allow the games to take place. The Greeks attached so much importance to these games that they calculated time in four-year cycles called" Olympiads" dating from 776 BC. Approximately how many years ago did these games originate