Simplify \( \left.\begin{array}{l}\frac{2}{5}+\frac{3}{4} \\ \text { a. } \frac{5}{9} \\ \text { b. } \frac{6}{15} \\ \text { c. } \frac{23}{20} \\ \text { d. } \frac{7}{18}\end{array}\right) \)

To simplify \( \frac{2}{5} + \frac{3}{4} \), we need to find a common denominator. The least common multiple of 5 and 4 is 20. We convert each fraction: \[ \frac{2}{5} = \frac{2 \times 4}{5 \times 4} = \frac{8}{20} \] \[ \frac{3}{4} = \frac{3 \times 5}{4 \times 5} = \frac{15}{20} \] Now we can add the fractions: \[ \frac{8}{20} + \frac{15}{20} = \frac{8 + 15}{20} = \frac{23}{20} \] Thus, the answer is \( \frac{23}{20} \), which corresponds to option **c.**