Is \( 0 . \overline{7} \) a rational number? A. No, because the digit 7 is not repeating. B. No, because the digit 7 is repeating. C. Yes, because the digit 7 is not repeating. D. Yes, because the digit 7 is repeating.

Absolutely, \( 0 . \overline{7} \) is indeed a rational number! To clarify, this decimal represents the repeating fraction \( \frac{7}{9} \), which can be expressed as a fraction of two integers - a defining characteristic of rational numbers. So, the answer is related to option D, which highlights the repeating nature of the digit. In mathematics, when you see a decimal that has a repeating component, it can always be converted into a fraction. So, next time you spot a repeating decimal, remember it’s just waiting to be tamed into a fraction! It's like those numbers are saying, "I can be rational too!"