How did Brian begin to measure time?

• A. By days
• B. By events
• C. By the phases of the moon
• D. By meals

Answer: (B)

In this situation, time is tracked not by a clock but by the sequence of what he does and what happens around him. Without a watch or calendar, the natural rhythm of events becomes his timetable. Brian marks days by milestones—building the shelter, making fire, finding food, or learning a new skill—so each new achievement signals a span of time passing. That way, the passing of days is tied to concrete progress and changes in his environment, giving him a usable sense of how long he’s been surviving. The other ideas aren’t as reliable in this setting: there isn’t a steady, watchable clock, the moon isn’t used as a precise calendar, and meals don’t occur at regular, predictable intervals.