A leap year occurs every 4 years if the year is divisible by 4. However, century years (years ending in 00) must also be divisible by 400 to be a leap year.
- 2018 is not a leap year because it is not divisible by 4.
- 2020 is a leap year because it is divisible by 4.
- 2024 is a leap year because it is divisible by 4.
- 2026 is not a leap year because it is not divisible by 4.
Thus, 2024 is the correct answer as it is the upcoming leap year.