Consider the two figures shown here. $$AB=16\ \text{cm}$$ in both the figures. Points $$P,Q,R$$ divide $$AB$$ into equal lengths in figure $$1$$. Similarly, $$P,Q,R,S,T,L,M$$ divide $$AB$$ into equal lengths in figure $$2$$. All the curves are semicircles. If $$[a]$$ and $$[b]$$ are the areas of the shaded figures respectively in figure $$1$$ and figure $$2$$, then

A

$$[a]-[b]$$ is a non-zero number

B

$$[a]=\frac{5}{4}[b]$$

C

$$[a]=\frac{4}{5}[b]$$

D

$$[a]=[b]$$