The Prime Meridian is located at zero degrees longitude and passes through _ a Greenwich, England b California, United States c Sydney, Australia d None of the above

The Prime Meridian is a global reference line for timekeeping and navigation, established in the late 19th century during the International Meridian Conference in 1884. It was chosen largely because of the prominence of the Royal Observatory in Greenwich, England, which was a key player in the development of navigation charts and timekeeping. In practical terms, the Prime Meridian serves as a baseline for the world's time zones, where each zone is measured in hours ahead or behind Greenwich Mean Time (GMT). This means that if you're standing on the Prime Meridian, you're at the center of the world's timekeeping system, making it quite the prestigious location!