Which option correctly expands UTC?

• A. Unit Time Coordination
• B. Unable to Contact
• C. Universal Time Code
• D. Unaccompanied Minor

Answer: (B)

Coordinated Universal Time is the global time standard used to keep clocks synchronized across all time zones, which is essential in aviation for schedules, communications, and logs. The official expansion is Coordinated Universal Time, a blend of atomic time (very precise) with leap seconds to stay in sync with Earth's rotation. Among the given options, the others don’t describe a time standard used in aviation or globally: one uses a misleading term like Unit instead of Coordinated; another, Unable to Contact, has nothing to do with timekeeping; Universal Time Code would imply a code rather than the established term; and Unaccompanied Minor refers to a passenger category. In practice, times are always referenced in UTC to avoid confusion across time zones.