calculus question

Question

Which of the following integrals represents the length of the curve  from x = 0 to x = 4?

	None of these

I'm leaning towards C but idk

Answer 1

b) is right formally, but at x = 0 derivative undefined, and this integral improper.

you can evaluate it by isolating from 0, for exmple you can take lover limit equal 0.0001 and so on

Answer 2

b) as it fits the standard formula for the arc length in 2D ..