To determine which option is a proportion, we need to check if the two ratios are equivalent.
A proportion is an equation that states that two ratios are equal.
For Option 1: \( \frac{5}{6} = \frac{15}{18} \)
- Simplifying \( \frac{15}{18} \) gives us \( \frac{5}{6} \), so this is a true statement.
For Option 2: \( \frac{5}{6} = \frac{20}{18} \)
- Simplifying \( \frac{20}{18} \) gives us \( \frac{10}{9} \) which is not equal to \( \frac{5}{6} \).
Thus, Option 1 is a proportion.