The following figure represents cost of transport vs locomotor speed in a species of vertebrate over three distinct gaits. At which speeds would it volitionally engage in each gate?

A. Roll: 10, run: 40, walk: 30

B. Roll: 50, run: 40, walk: 30

C. Roll: 30, run: 20, walk: 10

D. Roll: 40, run: 30, walk: 30

30- 8 Cost of Transport 10 10 20 30 Swimming speed 40 50 gait roll run walk