The correct option is A because there may be some important message
In the passage the narrator explains why he dislikes telephone and goes on to say that if he had one and it rang at inconvenient times like "when you are asleep, or in the
middle of a meal or a conversation, or when you are just going out, or when you are in your bath", he simply would not be able to ignore it thinking that "there may be some important news or message for you." In this context, option A is the best answer.