The correct answer is (d).
A leap year is a year with 366 days, as opposed to the usual 365 days. A leap year occurs every four years, except for years that are evenly divisible by 100 but not by 400. This is because the Earth’s orbit around the Sun takes approximately 365.2422 days. To account for this extra 0.0078 days, we add an extra day to our calendar every four years. However, this means that our calendar would slowly drift out of sync with the seasons. To prevent this, we skip the leap year every 100 years. However, we add a leap year every 400 years, which brings our calendar back into sync with the seasons.
So, the years 1300, 1100, and 1900 are not leap years, because they are evenly divisible by 100 but not by 400. The year 2000 is a leap year, because it is evenly divisible by 400.