Step-by-step explanation:To find the percentage decrease in the price of the toy, use the formula:\[\text{Percentage Decrease} = \frac{\text{Original Price} - \text{New Price}}{\text{Original Price}} \times 100\%\]In this case, the original price is $20, and the new price is $15. Substituting these values in:\[\text{Percentage Decrease} = \frac{20 - 15}{20} \times 100\% = \frac{5}{20} \times 100\% = 0.25 \times 100\% = 25\%\]So, the percentage decrease is **25%**. The correct answer is **C. 25%**.