The answer to this question is B.
Once the cow wouldn't walk into the pen, Jane started prodding him with a stick.
Rousseau talks about some of his experiences from he was younger and he talks about how he started to get involved in literature, he even talked about how some experiences made him very sad for a long period of time but that same sadness became happiness when he became older.
Classroom and hallwayare the subjects. But is the conjunction