How many days does February have in a leap year?

In a leap year, February has 29 days. Leap years occur every four years to help synchronize the calendar year with the solar year, which is the time it takes for the Earth to complete one orbit around the Sun. The Gregorian calendar, which is the calendar system most widely used today, adds an extra day to February to account for the additional approximately quarter of a day that it takes for the Earth to complete its orbit each year. Thus, instead of the usual 28 days in February, leap years include the 29th day. This adjustment ensures that the seasons remain aligned with the calendar.

In contrast, regular years have February with just 28 days, and other months have a fixed number of days as follows: April, June, September, and November each have 30 days, while January, March, May, July, August, October, and December each have 31 days. This makes B, with its acknowledgment of February's 29 days during a leap year, the accurate choice.