Shat is the additive identity on the set of rational numbers? a. 0 b. 1 e. -1 o d. \( 1 / 2 \)

In the world of rational numbers, the additive identity is a special number that doesn’t change other numbers when added to them. It’s like the invisible friend of math! For any rational number \( r \), when you add 0 (your choice for the additive identity), the result remains \( r \). So, if you choose \( r \) to be \( \frac{2}{3} \), then \( \frac{2}{3} + 0 = \frac{2}{3} \). Pretty neat, right? Therefore, the correct answer to your question is indeed a: 0!