March 5, 1999 was a Friday. What day of the week was March 5, 2000?

Introduction / Context:
From a known weekday, advance one year while accounting for leap years to find the weekday on the same date next year.

Given Data / Assumptions:

• Start: Friday (05-03-1999).
• Year 2000 is a leap year.

Concept / Approach:
From Mar 5, 1999 to Mar 5, 2000 includes Feb 29, 2000, so shift = +2 days (common year gives +1; leap year with Feb 29 between dates adds an extra +1).

Step-by-Step Solution:
Friday + 2 days → Sunday.

Verification / Alternative check:
Calendar lookup confirms Mar 5, 2000 was Sunday.

Why Other Options Are Wrong:
Monday/Friday/Tuesday correspond to miscounting leap-day effect.

Common Pitfalls:
Adding only +1 for a leap year even though Feb 29 lies between the two dates.

Final Answer:
Sunday