Which one of the following statements is correct ?

Explanation: As there is no real number which is both rational and irrational.So,OptionA is wrong. Take 2 irrational numbers 2+√3   & 2-√3  and the sum will be 4 which is a rational number.So, Option(B) is not correct.

As we know, every integer is a rational number. Therefore, option(C) is the correct one.

Final answer: Hence, we concluded that option(C) is the correct one. Every integer is a rational number.