Rise of a Jack arch is kept about

A

$$\frac{1}{2}$$ to $$\frac{1}{3}$$ of the span

B

$$\frac{1}{3}$$ to $$\frac{1}{4}$$ of the span

C

$$\frac{1}{4}$$ to $$\frac{1}{8}$$ of the span

D

$$\frac{1}{8}$$ to $$\frac{1}{12}$$ of the span