To find the value of \( \frac{5}{6} + \frac{3}{4} \), we must first find a common denominator for the fractions. The denominators are 6 and 4. The least common multiple (LCM) of 6 and 4 is 12. We will convert both fractions to have this common denominator.
\[ \frac{5}{6} \] can be rewritten as \[ \frac{5 \times 2}{6 \times 2} = \frac{10}{12} \].
\[ \frac{3}{4} \] can be rewritten as \[ \frac{3 \times 3}{4 \times 3} = \frac{9}{12} \].
Now, we add the two fractions:
\[ \frac{10}{12} + \frac{9}{12} = \frac{19}{12} \]
Thus, the correct value is \[ \frac{19}{12} \].