Hi there!
The sum of two rational numbers will always equal a rational number. Similar to adding fractions, if both denominators are the same then you can add them together. In the case of rational numbers, it is the same. Adding two of the same thing together makes the sum the same, rational.
ANSWER:
Option 3 - a rational number
Hope this helps!! :)
If there's anything else that I can help you with, please let me know!