Which of the following fractions is the smallest: rac23, rac69, rac73, rac83?

The given fractions are $\frac{2}{3}, \frac{6}{9}, \frac{7}{3}, \frac{8}{3}$.

After simplification, the fractions are $\frac{2}{3}, \frac{2}{3}, \frac{7}{3}, \frac{8}{3}$.
All these fractions have a common denominator of 3. When fractions have the same denominator, the smallest fraction is the one with the smallest numerator.
Comparing the numerators (2, 2, 7, 8), the smallest numerator is 2.
Therefore, the smallest fraction is $\frac{2}{3}$.

The options are:
(A) $\frac{2}{3}$
(B) $\frac{7}{3}$
(C) $\frac{8}{3}$
(D) $\frac{6}{9}$

Both $\frac{2}{3}$ and $\frac{6}{9}$ are equal to the smallest value. Since $\frac{2}{3}$ is the simplest form and is given as option (A), we select (A).

The final answer is $\boxed{\text{(A)} \frac{2}{3}}$.