Final answer:
In Stave 2 of A Christmas Carol, the characters are Scrooge and Marley's ghost. Marley's ghost warns Scrooge about his behavior and tells him he will be visited by three more spirits. So the correct answer is Option B.
Step-by-step explanation:
The characters in Stave 2 of A Christmas Carol are Scrooge and Marley's ghost. In this chapter, Scrooge is visited by the ghost of his former business partner, Jacob Marley. Marley's ghost warns Scrooge about the consequences of his selfishness and greed, and tells him that he will be visited by three more spirits.