The rectangle is divided into 5 equal parts, and 4 of those parts are shaded. This can be represented as the fraction \( \frac{4}{5} \).
Now, let's evaluate the options to find which of these fractions is equivalent to \( \frac{4}{5} \) when reduced.
- \( \frac{12}{16} \) can be reduced by dividing the numerator and denominator by 4, resulting in \( \frac{3}{4} \).
- \( \frac{28}{35} \) can be reduced by dividing the numerator and denominator by 7, resulting in \( \frac{4}{5} \).
- \( \frac{12}{14} \) can be reduced by dividing the numerator and denominator by 2, resulting in \( \frac{6}{7} \).
- \( \frac{20}{30} \) can be reduced by dividing the numerator and denominator by 10, resulting in \( \frac{2}{3} \).
Among the options, \( \frac{28}{35} \) reduces to \( \frac{4}{5} \).
Thus, the correct response is:
\( \frac{28}{35} \)