Step-by-step explanation:
the formula to calculate a circumference is

(consider x as the diameter)
so I'll be noting the circumference as C alongside the circle's ranking
a.

b.

c.

hope I helped
Its not the first two, I’m having trouble seeing those bottom two and what they are.
3rd one: y=ln x
The second choice is the answer
24 because she already completed four and if she completes twelve more that that will be 24 hope that helps