To interpret the model:
The rectangle is divided into 16 equal parts, and since it is divided into 2 rows and 8 columns, each part represents \( \frac{1}{16} \) of the whole rectangle.
Out of the 16 parts, the first 3 parts in each of the two rows are shaded, making a total of 6 shaded parts. This can be represented as:
\[ \frac{6}{16} \]
Now, simplify \( \frac{6}{16} \):
\[ \frac{6 \div 2}{16 \div 2} = \frac{3}{8} \]
Thus, \( \frac{3}{8} \) is the fraction used to divide 3 out of the 8 shaded parts.
Considering the choices given, the correct response to the interpretation of the model and the fraction used to divide \( \frac{3}{8} \) is:
34 Start Fraction 3 over 4 End Fraction