Days in a Year

There are 365 days in a year.

Explanation:
The concept of a year is based on the Earth's orbit around the sun. It takes approximately 365.24 days for the Earth to complete one orbit around the sun. However, this number is not a whole number, so it is necessary to round it to a whole number for convenience.

Leap Years:
To account for the extra fraction of a day, a leap year is added approximately every four years. In a leap year, an extra day, known as a leap day, is added to the calendar. This extra day, February 29th, brings the total number of days in that year to 366.

Calculating Leap Years:
To determine if a year is a leap year, the following conditions must be met:
1. The year must be divisible by 4.
2. If the year is divisible by 100, it must also be divisible by 400.

For example, the year 2000 was a leap year because it is divisible by 4 and 100, and also by 400. However, the year 1900 was not a leap year because although it is divisible by 4, it is also divisible by 100 but not by 400.

Conclusion:
Based on the above explanations, the most common type of year, known as a common year, consists of 365 days. Leap years, which occur every four years, have 366 days. Therefore, the correct answer to the question is option A) 365.