Final answer:
In Stephen King's novels, 'Derry' is the name of a fictional town that is frequently mentioned, making the correct answer option b) Derry, and it's a fictional town.
Step-by-step explanation:
In the novels of Stephen King, the name of the town that is often mentioned is Castle Rock, and it is a fictional town. This would make option (a) incorrect. Option (b) is also a fictional town called Derry, which is frequently used in King's novels. Option (c) Bangor is indeed a real town in Maine, and King has drawn inspiration from it for his fictional settings, but Bangor itself is not a fictional town. Lastly, option (d) refers to Haven, which is yet another fictional town created by Stephen King. Therefore, the correct answer to the question is b) Derry, and it's a fictional town.