Answer: The correct statement is it can always be written as a fraction.
Explanation:
Rational numbers are defined as the numbers that is expressed in the form of a fraction that is
where, 'p' and 'q' are two integers and

We always write final answer of any operation of two rational numbers in the exact form instead of approximate form. The fraction is an exact form while decimals are approximate form.
So, when we add two rational numbers then the final answer after simplification should be in the fractional form.
For Example: Addition of


Hence, the correct statement is it can always be written as a fraction.