I think it is the 4th one:)
Well, it is asking you to compare Sarah's limping to something.
There are many possible answers, just think of things that limp.
Sarah limped along the road like an injured dog.
Sarah limped along the road like someone with a broken foot.
Sarah limped along the road like an elderly woman.
Comment the excerpt, I want to help
I think its c cuz that what turtles are:\