Answer:
Domain will be all positive numbers.
Therefore Option D is correct.
Step-by-step explanation:
A tire is of circular shape so the circumference of a circle we know which is:
![C=2\pi r](https://tex.z-dn.net/?f=C%3D2%5Cpi%20r)
Where, C is circumference,, r is radius
So, Here the circumference of tire will also be: ![C=2\pi r](https://tex.z-dn.net/?f=C%3D2%5Cpi%20r)
Domain is the value that x will take
And here r is corresponding with r.
So, radius cannot be negative,
So, Domain will be all positive numbers.
Therefore Option D is correct.