Time zones are measured in relation to their distance from .the north poleb. the atlantic oceanc. coordinated universal timed. the equator   

Option c= Coordinated Universal Time

Explanation:

So, before going further you might want to know what time zone is. Timezones simply refers to the time at which a particular country or a particular region is,that is the local time of that region.

Well, we all know that option 'a' and option 'b' are two things that the answers can not be, or if you did not know, cheers! , now you know. And the reason is because both latitude and longitude are useful when it concerns time zones, but time zones are measured in respect to the longitudes. Which also, rules out the choice for the last option --equator. So, the only option left, and the correct option is the Coordinated Universal Time.