The graph shows how the amount of money Katya earns depends on the time she works. The graph titled Katya'a Earnings shows amount earned in dollars on the vertical axis from 20 to 200 increments of 20 and time worked in hours from 1 to 10 on the horizontal axis. The graph shows a line passing through (0, 0), (5, 80), (10, 160). How much does Katya earn per hour? A. $16.00 per hour B. $6.25 per hour C. $20.00 per hour D. $1.60 per hour