For exercise after work, Albert (A) went running and Tanisha (T) walked for exercise. Their times and distances are shown in the graph below. How much faster was Albert running than Tanisha walking, in miles per hour? Explain how you found your answer.

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A.
Albert ran 3 miles per hour faster because Albert runs 6 miles per hour and Tanisha walks 3 miles per hour.

B.
Albert ran 10 miles per hour faster because Albert runs 10 miles per hour and Tanisha walks 20 miles per hour.

C.
Albert ran 3 miles per hour faster because Albert runs 10 miles per hour and Tanisha walks 20 miles per hour.

D.
Albert ran 10 miles per hour faster because Albert runs 6 miles per hour and Tanisha walks 3 miles per hour.