The correct option is C Real number.
The addition of a rational number with an irrational number will result in a non-terminating and non-repeating number.
Let's take an example.
12+√3
=0.5+1.732...
=2.232...
This is a non-terminating and non-repeating number, i.e., an irrational number.
Also, an irrational number is a real number.