Which part contains the fractions in ascending order ?

Answer: Option A

Clearly,
$$\begin{array}{rl}& \frac{11}{14}=0.785\\ & \frac{16}{19}=0.842\\ & \frac{19}{21}=0.904\end{array}$$
Now, 0.785 < 0.842 < 0.904
So, $$\frac{11}{14}$$ < $$\frac{16}{19}$$ < $$\frac{19}{21}$$