Tire Town, a tire retailer, had a steady 4% return on sales for 10 years. Over the following 5 years until now, it increased to 25%. What is the most likely reason?

1. Tire Town opened a second location in another city 5 years ago.
2. Tire Town added a second, different product line 5 years ago.
3. Tire Town had a dramatic increase in tire sales over the last 5 years.