Answer:
The bottom one on the second page.
Explanation:
It's not the first one, because it's not like they drove 200 miles while using 0 gallons of gas. It's not the first two on the first page, actually. It's not like there's a decrease in the miles traveled overtime, or a decrease in the gallons of gas used overtime. And finally, it's not the top one on the second page because they aren't using 200 gallons over the course of 10 miles, they are traveling 200 miles while using 10 gallons of gas. This leaves us with the bottom one on the second page. This is correct because, as you said, they traveled 10 miles over the course of 200 miles, and this is the only graph that correctly shows the increase in the gallons of gas used and the increase in the number of miles traveled.