Which of the following is a leap year?

2000

A leap year is a year that is evenly divisible by 4, except for years that are divisible by 100. However, years divisible by 400 are leap years again.

Now, let's apply this rule to the options:

i) 1500: Divisible by 4 but not by 400. So, not a leap year.

ii) 700: Not divisible by 4. So, not a leap year.

iii) 1300: Divisible by 100 but not by 400. So, not a leap year.

iv) 2000: Divisible by 4, also divisible by 400. So, 2000 is a leap year.

Therefore, among the given options, the leap year is 2000.