Answer :

 D) timezones
There are 24 time zones earth is divided into

Answer is: D) time zones.

Earth is divided into 24 timezones.

Most timezones are exactly one hour apart.

Timezone is a region on Earth bounded by lines of longitude.

Coordinated Universal Time (UTC) is the basis for modern civil time.

For example, UTC±00:00 is the Western European Time (Ireland, Portugal and UK).

UTC+01:00 is Central European Time, West Africa Time.