How are zones lying in longitudes east of zone zero numbered?

The correct answer is "Minus" because the numbering system for time zones east of the prime meridian (the location of zone zero) follows a convention where they are indicated as "minus" or subtractive in relation to Coordinated Universal Time (UTC). Specifically, as you move east from the prime meridian, the time increases; however, this increase is denoted in relation to world time, which essentially treats UTC as a reference point.

This is founded on the concept that time zones can be represented in a 24-hour format, where UTC+0 is the prime meridian, and any zone to the east would be designated by subtracting hours from UTC. While it might be intuitive to think of positive terms like "Plus" or "Positive" to indicate eastward movement, in this context, the systematic labeling of zones to express their times relative to UTC is more accurately captured through the use of "Minus."

The options involving "Plus" and "Positive" suggest an affirmative notion of time gain rather than the actual subtractive terminology employed in nautical and aeronautical contexts for clear communication. Therefore, the choice of "Minus" directly reflects the established convention used in time zone numbering systems.