Correct answer: Set of months in a year
Explanation:
A finite set is a set that has a countable number of elements.
- The set of all natural numbers is infinite, as natural numbers go on without end.
- The set of all prime numbers is also infinite, since there is no largest prime number.
- The set of months in a year has exactly 12 elements, so it is finite.
Therefore, the set of months in a year is the only finite set among the given options.