Short Answer 
The analysis highlights the importance of having complete data for accurate evaluation, noting that only sales data for 2001 is available, while 2002 data is missing. Consequently, conclusions drawn are limited, with option D being the only valid choice as it acknowledges the insufficiency of the information provided.
Step 1: Identify the Key Information
It’s essential to pinpoint what data is available and what is absent in any analysis. In this case, we know that 200,000 vehicles were sold in 2001, but no sales data for 2002 is provided. Therefore, we have only a single year for reference, making any further evaluation impossible.
Step 2: Recognize the Limitations
An acknowledgment of the lack of context is critical when analyzing sales figures or any statistical data. Without the 2002 sales figures, we face significant limitations since we cannot determine whether sales increased, decreased, or remained the same compared to 2001. This demonstrates the necessity of having complete data for an effective assessment.
Step 3: Conclude on the Available Options
Based on the analysis, the best conclusion you can draw is that the information provided is insufficient. Option D states this correctly, while other options may suggest trends without the necessary data. It’s crucial to avoid making assumptions without evidence; hence, option D is the most valid choice.