A historical record is dated 23 December 2020. What was its weekday?

Correct answer: Option D — Wednesday. Counting total odd days up to this date, or using a verified Gregorian calendar calculation, gives weekday index 2 where Monday is 0; therefore the day is Wednesday. Option A (Thursday) is rejected because it does not equal the computed result; it represents a counting, direction, leap-year, interval, or hand-motion error. Option B (Friday) is rejected because it does not equal the computed result; it represents a counting, direction, leap-year, interval, or hand-motion error. Option C (Sunday) is rejected because it does not equal the computed result; it represents a counting, direction, leap-year, interval, or hand-motion error.