Classify the year 2100 correctly according to the Gregorian leap-year rule.

Correct answer: Option C — Ordinary year. 2100 is divisible by 4. Hence it is a ordinary year. Option A (Leap year) is rejected because it does not equal the computed result; it represents a counting, direction, leap-year, interval, or hand-motion error. Option B (Century year only) is rejected because it does not equal the computed result; it represents a counting, direction, leap-year, interval, or hand-motion error. Option D (Cannot be determined) is rejected because it does not equal the computed result; it represents a counting, direction, leap-year, interval, or hand-motion error.