For this case, we have by definition, that an irrational number is a number that can not be expressed as a fraction [tex]\frac {a} {b}[/tex], where a and b are integers and b is nonzero.
Some examples are:
[tex]\sqrt {2}, \sqrt {3}, e, \pi.[/tex]
So, that the answer is [tex]\pi.[/tex]
Answer:
Option C
