The answer is D. The bus picked up people, and the graph is saying it dropped people off.
ANSWER

EXPLANATION
The sum of an arithmetic sequence whose first term and last terms are known is calculated using

From the given information, the first term of the series is

and the last term of the series is

The sum of the first 26 terms is



2 represents the thousands. Round the number after 2 which is 6. Since 6 is greater than 5, you round it up and you get 53,000.
8.5 x 250,000 = 2,125,000
2,125,000 x .00001 = 21.25km
1cm = .00001km