The correct answer is the following: option b. In "The Night Thoreau Spent in Jail" John says the one rule in his and Henry's class is that there are no rules.
"The Night Thoreau Spent in Jail" is a two-act play written by authors Robert E Lawrence and Jerome Lawrence that was first published in 1970. It tells the story of writer Henry Thoreau and the events that followed one night in 1846 where he had to spend a night in jail as a consequence of not paying his taxes. In the play John says to Ellen that there is only one rule in his and Henry's class and that one is that there are no rules, therefore she is welcome to join the class anytime she wants to.