Answer:
Option 3) Prime numbers is correct
Universal set = The set of Prime numbers.
Explanation:
To find the Universal set:
The set of all even numbers are numbers divisible only by 2 .
The set of all prime numbers are divisible by 1 and the number itself
Since, we have to take only positive numbers
Carrie has found out the set of even numbers within the set of prime numbers
So, 2 is the only number belongs to this set because 2 is a even prime number.
Hence,universal set should be prime numbers.
Therefore, Option 3) prime numbers is correct.
Universal set = The set of Prime numbers.