The correct answer is Statements (A) and (B) both are correct. Explanation & Key Takeaways: Earths time zone: • A local time is a time calculated on the basis of a specific meridian passing through a particular place, though the place may be included in some other time zone. • All the places located on the same meridian have noon at the same time. • Time zones can be understood as areas on the Earth that are divided on the basis of longitudes and that have the same standard time. • Every longitude has a different local time due to the rotation of the Earth. Hence, Statement a is correct. • The Greenwich Meridian is the starting point that divides the Earth's surface into different time zones. • A standard time system is utilized to remove the difference in the local time. • Each time zone is 15^(o) or 7.5^(o) longitude wide and the local time is one hour or a half an hour earlier than the zone immediately to the east on the map. • Longitude plays a major role in the determination of local time. • The 'whole earth' is divided into twenty-four time zones of approximately equal distance. • Countries spread over large areas have adopted more than one 'time zone' for convenience. • Russia, America, and Australia have adopted 11, 6, and 3 time zones respectively. • 1º longitudinal difference means 4 minute time difference. • The entire earth is divided into 24 zones and each time zone covers 15 degrees longitude.