For which models was the percentage variation in production from 2007 to 2008 the maximum?

Answer: Option D

$$\begin{array}{rl}& \text{Percentage Variation}\\ & \text{Modal A}=\frac{40-30}{30}\times 100=33\frac{1}{3}\%\\ & \text{Modal B}=\frac{20-15}{15}\times 100=33\frac{1}{3}\%\\ & \text{Modal C}=\frac{20-15}{20}\times 100=25\%\end{array}$$