Correct option is C
The correct answer is: (c) Sum of two irrational numbers is not always an irrational.
Explanation: The sum of two irrational numbers is usually irrational, but this is not always true.
Example 1: If you add-

then the result is zero, which is rational.
Example 2: Adding two different irrational numbers, such as-

which would result in an irrational number.
As a result, the sum of two irrational numbers is determined by the numbers themselves.