Answer:
Based on this excerpt, the contextual meaning of the word jostle is D: to push, elbow, or bump against.
Step-by-step explanation:
I chose D because the whole concept of the sentence is to show how, although they found obstacles, like men and women crowded together on the sidewalk, they managed to get by and stick together by pushing them, by making the space for themselves. In this context, the word jostle is to push, to bump against, to elbow; they needed to make space in order to keep walking.