<span>They decide to wait until nightfall to peek into the Radley house because it would be harder for other people to see them at night. Also it would be easier for them to see into the dark Radley house. They do not think that Attucus will notice them being gone.</span>
Can you put the rest of the passsage
I'd say the answer is A) like rivers, people keep moving and finding new paths.
He wants to say that even black people will manage to find a good future, following a new path, the same way any other human being will.
The other examples do not seem correct to me.