Final answer:
The pair of coordinates most likely to represent two places within the same time zone is C) 15°N, 120°W and 20°N, 20°W because they share the same longitudinal coordinate, which determines time zones.
Step-by-step explanation:
The pair of coordinates most likely to represent two places within the same time zone is C) 15°N, 120°W and 20°N, 20°W. This is because they share the same longitudinal coordinate (the 'W' part), which suggests they are on the same vertical slice of the Earth and thus would experience the same time zone. All other options have either vastly different longitudinal or latitudinal coordinates, or both. Latitude tells us how far north or south a location is, while longitude tells us how far east or west. Time zones are primarily based on longitude, as the Earth rotates around its axis. The closer two places are longitudinally, the more likely they are to share the same time zone, ignoring political boundaries that may affect time zone boundaries.