1. **State the problem:** We need to find the total amount of pie remaining when the fractions of different pies left are $\frac{3}{7}$, $\frac{2}{7}$, $\frac{3}{7}$, and $\frac{5}{7}$. 2. **Formula and rules:** To find the total fraction of pie remaining, add the fractions. Since all fractions have the same denominator 7, we can add the numerators directly. 3. **Add the fractions:** $$\frac{3}{7} + \frac{2}{7} + \frac{3}{7} + \frac{5}{7} = \frac{3+2+3+5}{7} = \frac{13}{7}$$ 4. **Interpretation:** The total pie remaining is $\frac{13}{7}$, which is an improper fraction meaning more than one whole pie remains. 5. **Answer:** The correct choice is A. $\frac{13}{7}$.